Na doubt they would reveal anything at such an event. I guess we have to wait until Blizzcon 2013 sadly. Or if you mean new patch info... doubt that either :P
Nope. It will just be a World championship, nothing else. Not sure what the big hype blizzard is trying to make though... I mean Trailers and stuff... Seems unusual. But Blizzard has failed to do such things as Revealing when I expect them to... from obvious times. Blizzard usually provides loads of information regarding their games. Which is rather easy to spot with the different fansites .