Why the Blizzard attend PAX EAST 2013?

The Blizzard will attend the PAX EAST 2013 in Boston, let us guess why they will attend the game show? Did they have any important news release?

Famous electronic game development company Blizzard Entertainment has they own unique player activity Blizzcon, they rarely participate in the game show on the public, they usually announced something on the Blizzcon.

But Blizzard Entertainment will attend PAX EAST 2013 on March 22-24 , Blizzard will bring any news for us on the PAX EAST, players think the biggest content may be is the host board about "Diablo III", or publish some of the content about Warcraft film, what do you think about this?