I believe Blizzard announced they aren't going to release anymore exspansions.
Patch 4.3
The new 5 man dungeons will help to introduce the Deathwing Raid.
The current plan with the Deathwing raid is to have it all available immediately upon release.
The Deathwing raid will be smaller than Ulduar with many phases or encounters with Deathwing.
Patch 4.4 will bring a world event before the next expansion.
The next expansion should be released with a "meaningful difference" in the release timeline compared to previous expansions.
A new Darkmoon Faire
MMO-Champion - Patch 4.3 Preview - The All New Darkmoon Faire
MMO-Champion - Gamescom Patch 4.3 Interviews, Blue Posts, Fan Art, Comics
DISCUSS! High hopes for this next patch? I'm excited as i've grown extremely bored of instances / pve in general.
Source? You'd have to be high to think blizzard wouldn't milk world of warcraft for more profit!