Personally, I don’t think it will show up. At most, we’ll probably just get what we saw last year. Nobody in the know seems to have heard anything yet and Square Enix's showing is shaping up to be western focused.
Last year’s showing was about promoting the PS4. If it’s not going to release anytime soon, then there is no need to show it at E3 this year. There will be plenty of other opportunities to show the game.
What I see happening is one more big update later this year at TGS14 and then another break. Once that break is over, it'll probably be E315 and things will be a bit more consistent from that point on.
Hard to say. Depends on so many things like when will the game come out and what titles come out before it?
If it came out this year then yeah, they'll show it. If it comes out holiday 2015, then there is no need to show it yet.
Games that come out before Final Fantasy XV will be the main priority and get the marketing focus. We did not start to get news on Final Fantasy Type-0 in Japan consistently until Tactics Ogre: Let Us Cling Together, The 3rd Birthday, Kingdom Hearts Birth by Sleep Final Mix, Dissidia 012 Final Fantasy and Final Fantasy IV: The Complete Collection came out first. That period when things were consistent for Final Fantasy Type-0 went on for a good 7 months.