EU Forum MVP Schwick has posted a very nice and very thorough listing of everything we know about patch 2.2, 2.3, and the next expansion. As far as I know, there's nothing really new here, but it's a terrifically indepth listing of every rumor, hint, and suspicion that we've heard so far.
Some of the exciting ideas still coming are new emotes, a tanking Pally revamp, a new stealth animation for Rogues, and totem timers for Shamans (currently, I use Totemus, and that suits me just fine). Also on the to-do list includes VOIP, guild banks and housing, and speculations for the next expansion include Northrend (I've got my money on this one, because the Scourge have it coming), "Beyond Outland," and the Emerald Dream.
I'm sure we'll learn more eventually (expect big things at Blizzcon, I foresee), but until then, this roundup is as comprehensive as it gets. Thanks to Schwick for compiling this all together for us.