They had a 2005, 2007, 2008, and now 2009... so they really just missed one year. It's not like it has a history of being every other year. Plus with SC2 hopefully coming out soon, D3 on the horizon, I'm sure they've got another WoW expansion being planned, and their "Unannounced Next-Gen MMO," there's a lot for them to put up on display this year.

I went for the first time last year, and I thought it was well worth it. Definitely going again this year!