One of the main new updates was

Skype integration
You may now enter your Skype username, in addition to AIM, ICQ, MSN, and Yahoo. Calls, chats, and more may be initiated through vBulletin.

Yes/No radio buttons changed back to horizontal orientation
The line break added between the yes and no options in the admin control panel has been removed. Yes/no rows will now look as they did in previous versions.

Also other things were upgraded, but that is most notable for most of the users.

Also note, new smilies loaded in the other day, as well as new avatars (dependant on post count). If you have avatars or smilies you wish to have loaded, please post them here and they will be considered for upload to the forums (I reserve the right to deny anything I deem unsuitable for these forums).