New teams are likely just not ready to announce what they are working on yet their games are still likely 1+ years off at least unless they are quick Kinect games.
Lionhead started working on a next gen game of course they won't announce it until next gen is announced, that game is likely 2 years off.
Epic technically did announce something, as they own People Can Fly. Epic proper have already announced a game FortNight and they are apparently working on a PC exclusive as well which will probably be a free to play Unreal game, and of course their big Unreal 4 showcase game which could well be announced on the 7th when they fully unvail UE4, even tho it is at least 2 years off at this point.
Turn 10 won't announce their game until next year as they are focusing on promoting Horizon this year it would be bad for sales if they started talking about Forza 5 while they are marketing Horizon.
That said MS will announce the next box by the end of E3 2013, there are too many leaks and talk about next gen games for them not to.
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