Sony have announced the times for the press conference they will be holding at Gamescom towards the middle of August. We expect a lot of news about Playstation Vita, even if Playstation 3 won't be forgotten. The conference kicks off at 6pm (German time, so 5pm UK time) on August 16.
Microsoft will be holding their Play Day and EA will have their Gamescom media briefing on the same date.