News from Blizz Con are all rotating around Diablo 3, another class has been revealed, the demon hunter (which seems a lot like the amazon from Diablo II) is coming to kick some ass. Some of his/her abilities include, fan of knives, molten arrow, grenade, bola, and entangling shot. If you want to take a further look, check out this video.
Other Diablo news include a new arena system, which will work much like WoW arena system. You be able to do team PvP, or do 1v1 duels. The developers went on to say that they wanted to add deeper, more organized, and more fun to the PvP experience of Diablo III.
No release date yet for Diablo III, and judging by the number of classes they still have to announce (Druids!), I would say its still many months away.
Source: Diablo III Official Website