What we don't know
Team Japan - very large, multiple games developed simultaneously- Yes
--Team Gravity - 3 years since last game- probably just the remaster, GR2 TGS
--Team Ico - last game (lol)- In my dreams they will be
Polyphony Digital - 2 years since last game- Maybe, GT 7
Sony Bend - 3 years since last game- Defiantly, show us Demonite
Santa Monica - 2 years since last game- No, Maybe at PSX
Sucker Punch - 1.5 years since last game- Maybe a teaser
Guerrilla Games - 2 years since last game- Yeah Horizon will probably be reviled
--Guerilla Cambridge - 2 years since last game- I think Killzone might be ready
Media Molecule - multiteam, 4 years since last game, Tearaway developed alongside new IP- Probably, either E3 or GDC
Sony London - usually releases several games per year, probably working on Morpheus- Probably another more detailed in-depth heist demo
Quantic Dream - second party technically, 2 years since last game- Don't know