Blizzard has named the last content patch before Wrath of the Lich King -- it's "Echoes of Doom." They've created a page for patch 3.0.2 in their Under Development section, and all of the features we've become familiar with over the past few months -- from Inscription to two new Arenas (no mention yet of the new battleground, unless they just meant Wintergrasp) and lots of UI modifications -- are listed right there as ready to go in with the new patch.
The page still seems like a placeholder, though, so expect to see it changed over the next two weeks or so -- we'll see more detailed patch notes, of course, near release, and I wouldn't be surprised to see some information about the World Event that will likely kick off Wrath. "Echoes of Doom" -- are you excited?
Update: WoW Insider has obtained this exclusive video of what the new patch may be like.