Well, there are certain things we do know (based on job posting)...
Guerilla Games (Amsterdam):
All seem to point out that most of the studio (if not all of them) are working on Horizon Zero Dawn. Although, it is possible a very small (like you said) may be prototyping their next project (could be another new IP, but it it will most likely be a Horizon sequel, if it does well).
Guerilla Cambridge:
Not only they are working on RIGS, which is supposed to be a launch title, it seem likely that they will be working on a multi-million dollar franchise. Could be Killzone... or Resistance (since
the trademark was renewed by SIEE in the past year and a half). One or the other is a win-win situation for me. (UPDATE: Two new job posting:
One for Audio Programmers, which one of the responsibilities being "Model 1st and 3rd-person weapon fire and reload triggering..." The
other for Game Systems Programmers asking to "have a particular passion for developing frontend menu and in-game HUD systems within an online environment".) It's clearly a shooter game. Whether it is a FPS or a TPS remains to be seen.
Sucker Punch:
We all have been teased by SP, Shinobi and Verendus regarding their next project. That it won't be inFamous-related, most likely a new IP (could also be a reboot of something). That they will step up their game visually compared to Second Son (which to me implies something photorealistic). Although, the only we can be more-or-less sure about is that the game will likely be a Third Person action/adventure game.
PixelOpus
A very young and small studio (Indie style). Whatever they could be working on, it will most likely be one-off projects that are set to be digital-only titles.
North West studio
Sony created that studio specifically for the PS VR. Based on
a job posting, they are looking for artists with stylised folios similar to Ghibli style. Will it be an adventure, an RPG, I don't know. Since the studio is very young, we should not expect it to grow to a 100 people type of projects, especially considering that VR will be their main focus. I don't see big AAA full-games being work on exclusively for PSVR.
Naughty Dog:
Their last game (UC4) came out last month. So... most of them should be back to work pretty soon. Obviously, their next project is the UC4 single-player story DLC they said they would be working on. Although, if it is anything like the one they made for TLOU, half of the team will be assigned to it. As for the rest, they will most likely join the others and continue to prototype different ideas for their next big game. It could be a sequel to TLOU (with new chars or not) or a new IP (possibly Sci-Fi as they teased it a little bit).
Media Molecule:
Well they are working on Dreams, but how many are working on it. No idea. Although, since they are a small team, I expect that a part of them may be prototyping other stuff. Maybe playing with some old IPs... or a new one (unlikely).
Sound like a title Sucker Punch could use for their next game/IP, if it's anything like their previous games (open-world, third-person action adventure). Also, based on rumors (I think they were from both Shinobi and Verendus), it should be a step up visually compared to InFamous Second Son.
Keep them coming, Sony.
