http://us.battle.net/blizzcon/en/blog/19913840/blizzcon®-2015-map-and-schedule-10-13-2015
Looks like the Overwatch area will be like last year with a playable demo (probably more complete since the game will go into closed beta around this time).
The D3 team will be in a real life version of the Slaughtered Calf Inn (the small tavern in New Tristram) where they will probably conduct those informal little chat sessions with attendees.
The main focal point is likely going to be Overwatch, the impending launch of Legacy of the Void, and World of Warcraft: Legion.
