Then again, if you look at the timeframes, it's still a little soon -- the acclaimed Burning Crusade cinematic actually dropped on the Spike Videogame Awards in December of 2006 (just a month before BC was actually released in January of 2007), so since there's still some time until the Wrath release, there will still be some time until the cine shows.
In fact, it's looking more and more like BlizzCon 2008 might be the place to see it. With a rumored release date of sometime in November, Blizzard's big convention in October would probably be the perfect place to show off the next, undoubtedly beautiful chapter in the fall (and maybe even redemption?) of Arthas Menethil. Plus maybe they'll put a Gnome in there this time around.