You can now configure Q to either send you NOTICEs or PRIVMSGs. This is done using the new USERFLAGS command:
/MSG Q USERFLAGS +n - sets to NOTICE (default)
/MSG Q USERFLAGS -n - sets to PRIVMSG

New flags Some new flags have been added to users (CHANLEV):

+k KNOWN - This is a new level of access below VOICE (+v). It doesn't entitle you to getting op/voice on the channel, but it identifies you as a known user. This allows you to set personal flags, and use the INVITE command. It is also used in conjunction with the +k chanflag (see below).
+g GIVE VOICE - Similar to L, this combines with +v to give you autovoice when you join the channel. Note that +av will no longer do this (and in fact is no longer allowed, see below).
+p PROTECT - This protects your op or voice on the channel (i.e. restores it if it is lost for any reason). It has the same effect as +p CHANFLAG, but on a per-user basis.
+d DEOP - This is a "punishment" flag that prevents the user ever getting ops.
+q QUIET - This is a "punishment" flag that prevents the user ever getting voice.

Personal flags are a new category of chanlev flag. Accessed via CHANLEV as normal, these can only be set and cleared on yourself and cannot be seen from others. Note that you will need at least known (+k) access to set these on a channel. The personal flags are:

+w HIDE WELCOME - you can set this if you get bored of being spammed with the welcome message every time you join the channel
+j AUTOINVITE - if you set this, Q will invite you to the channel when you AUTH.

Q is now strict about not allowing non-sensical combinations of flags. For example, you can't be banned (+b) if you are a master - since masters can just remove +b. You can't have autoop (+a) without op, and you can't have autoop and autovoice at the same time. Also, the new PROTECT (+p) flag includes autoop/voice functionality so you can't have +a/+g set if you are +p.

Like L, you can remove any of your own flags (except +b, +d or +q).

A new command GIVEOWNER has been added for the purposes of giving +n to other users. This is no longer possible via a normal CHANLEV command (although CHANLEV still allows for owner removal). The GIVEOWNER command needs to be run twice - the second time using a code provided the first time. This should make accidentally giving away +n a lot harder.

Q now has a few new functions related to bans, these are:

Ban enforcing
You can configure Q to kick banned users off the channel automatically. This is controlled by the +e chanflag.

Ban expiry
You can configure Q to auto-remove channel bans after a certain time. This is controlled by the new BANTIMER command.

Temporary bans
You can now set "Q bans" with an expiry time, using the new TEMPBAN command. For clarity, the old BAN command has been renamed to PERMBAN (but BAN still works for now).

You can configure Q to enforce, or prohibit, any combination of modes on the channel (including limits and keys). This is done via the new CHANMODE feature - CHANMODE +mode will enforce that mode on the channel, and -mode will prevent it being set. Note that because both + and - modes are allowed, you have to specify the complete list of modes whenever you change it. This replaces the SETINVITE feature of L, and the +k and +l chanflags and associated KEY and LIMIT commands from Q. Auth history feature

A new feature to track auths to your account has been added. Accessed via the AUTHHISTORY command, it shows you the last 10 logins to your account with the hostmask (and disconnect times). The old AUTHHISTORY command from Q is now called CHANOPHISTORY.

The list of available channel flags has been overhauled, and the following flag settings are now available:

+a, +g, +p (AUTOOP, AUTOVOICE, PROTECT) These have exactly the same effect as giving the chanlev flag to every eligible user. So you can turn autoopping on and off for the whole channel in one place - although the chanlev flags can still be used as well (either being set is enough).
+c, +f, +t, +b, +p, +w (AUTOLIMIT, FORCETOPIC, TOPICSAVE, BITCH, PROTECT, WELCOME) function the same as the old Q
+e (ENFORCE BANS) - see above
+v (VOICE ALL) - This chanflag will cause Q to voice everyone who joins the channel, unless they have +q chanlev flag set.
+k (KNOWN ONLY) - This chanflag will cause Q to kick anyone who isn't known (+k or above) out of the channel. Useful for extra security for private channels. It will ban users if they aren't prevented from rejoining by +i.

Note that +k and +l have been removed, replaced by CHANMODE as described above.

You can now get some statistics including maximum size and total number of joins on your channel. Statistics are maintained from the time each channel is created, but "resettable" statistics are also kept that can be reset. Use the CHANSTAT command to view these statistics, or reset them.

It's now possible to get a list of all the users on the channel, who they are authed as and what flags they have on Q. In order to get the list you need to be known on the channel and be on it. Use the USERS command to see the list.

/AUTH command (new):
All QuakeNet servers now support an easy to remember AUTH command. This command can be used instead of the old method to authenticate to our main network service, Q. For example:
/MSG Q@Cserve.quakenet.org auth [username] [password]
can now be:
/AUTH [username] [password]
This update also reduces confusion in remembering what you have to authenticate to and increases security.

/SILENCE command (updated):
The /SILENCE command now supports multiple hostmasks in a single command, for example:
/SILENCE +*!*@*.host.com,-nick!*@*,+*!ident@*
/SILENCE now also supports exceptions by prefixing the hostmask with a “~” character, for example:
/SILENCE +~nick!*@*
will allow you to see messages and invites from that user even if their host matches another ‘silenced’ hostmask. /SILENCE now supports CIDR masks to silence a large block of IP addresses for example:
/SILENCE +*!*@12.34.56.67/24
Please note that only CIDR masks that are /16 and greater (up to /32) are allowed for security reasons. /SILENCE now supports authnames using the +x hostname format to silence users by their Q account name, for example:
/SILENCE +*!*@authname.users.quakenet.org

/WHO command (updated):
The /WHO command now has two additional flags to compliment our other upgrades, these are the ‘a’ flag to match authnames (account names), which for example can be used as:
/WHO [authname] a
which will return a normal WHO reply for any user with that authname. The ‘a’ flag can also be used on conjunction with the other /WHO flags such as:
/WHO [authname] a%h
and so on. The other additional flag added is the ‘d’ flag which lists users hidden by the delayed join (channel modes +D and +d) and can be used as:
/WHO [#channel] d

/LIST command (updated):
The /LIST command now supports pattern matching for channel names, for example:
/LIST #*channel*
matches any channel with the string ‘channel’ in the name. Whereas:
/LIST !#*channel*
matches any channel without the string ‘channel’ in the name.
Please use “/LIST help” to see a full list of options for the /LIST command.

Ident rules relaxed:
The minimum requirement for idents have been relaxed to the following rules:

• Only one '-', '_', or '.' is allowed (or two, if not consecutive), but not as the first char
• No other special characters are allowed
• Name must contain at least one letter