As for what how much will be included, deleted scenes-wise, here are the runtime breakdowns for past JJ Abrams films blu-rays…
Mission: Impossible III: 5:21
Star Trek: 13:27
Super 8: 12:47
Star Trek Into Darkness: (can’t find a exact runtime but there’s 7 scenes, including some extended and alternates)
The Force Awakens: 5:48
So it’s probably safe to say we won’t get nothing, but I’m trying not to get my hopes too high up.