SE will do what SE does best:
- Give no information in order to drive "hype"
- Use E3 as a venue to make an announcement about an announcement at TGS which will be an announcement for Nov/Dec about FFVII:R and KH3.
- Reveal games from series we all love and loved, and it's yet more mobile games, as that racked in something like billions the last financial year?
So SE aside, this will definitely be one of the weaker E3s in general as pretty much everything people waited for has already been released or is so far off we shouldn't really expect much. Maybe there will be surprises, but not expecting too much from anyone.