Another big thing he mentioned was the simplification of Affliction's rotation. It's not something I'm completely sold on, considering I actually have a lot of fun with Affliction, but the stuff is a bit of a headache to keep track of and I do need AddOns to help me monitor all those debuffs. Ghostcrawler also notes that Warlock DPS -- mostly Affliction, at least -- is built up over time, but since fights don't last very long, they're looking at how to fix things. Although he also says it might fix itself in Ulduar, which won't be the ez-mode players have been treated to in early Wrath.
Blizzard will also be improving demons, which is totally awesome considering they're worlds better now than they were four years ago. Finally, Ghostcrawler gives a nod to PvP, knowing that Warlocks do need a bit of work there, too. Very encouraging words to kick off our 2009, don't you think?