Cool, a predictions thread! In all honestly, I fully expect that some of these will ever even come close to happening, but it's nice to dream...
Nintendo:
- Fleshing out of StarFox, with the reveal of singleplayer story campaign. Multiplayer is briefly talked about.
- Announcement of the next mainline Mario 3D game (hopefully, a successor to Galaxy 2)
- Announcement of next Retro Game, with brief teaser confirming it is one of Nintendo's dormant IPs.
- Announcement of new Earthbound title with original staff returning.
- Announcement of new Mistwalker RPG for WiiU with Sakaguchi at the helm.
- Pokken fighters roster update/reveals and global launch window.
- New amiibos, 2(?) new Smash characters.
Microsoft
- Fleshing out of Scalebound, with gameplay being shown for the first time.
- Crackdown live demo
- Gears of War HD remake announced, followed by teaser for new GoW game.
- Halo 5 gameplay
- Forza spinoff #3 announced
- Announcement that Phil Fish has been hired by Microsoft, and will make Fez 2 for the Xbone.
- Banjo-Kazooie, Battletoads, Conker, and Perfect Dark announcements.
- Shangheist revealed to be alive, with gameplay shown off.
Sony
- Agent revitalized and exclusive to the PS4
- Fallout 4 confirmed to get exclusive content for the PS4.
- God of War 4 shown off, along with a tease of SSM's other game.
- Uncharted 4 multiplayer revealed.
- Guerrilla Games new IP revealed, along with Media Molecule's new game.
- Sony hires Kojima and announces that Dormant Hillocks will be his first project, with Guillermo Del Toro.
- Sony shows off one last thing, promises it as the game everyone has been waiting for, trailer pops up with the phrase "The Last Guardian..." and it transitions to "...of Bullworth Academy is back!" Bully 2, exclusive to PS4.