Let the speculation commence!
A good guess might be like with Jurassic World. Look for franchises that have a film release coming up around that time and where the market isn't already saturated with games for that franchise (eg: Don't expect a Marvel game). Also something that might work well as a park management game, which seems to be FD's forte.
Hmm... a new Indiana Jones movie is planned for 2021. Or... hey... i think i've got it. Avatar 3 is planned. That could synergise very well with ED's planetary generation tech and space stuff.
Ok, i'm calling it, its going to be based on Avatar. First or third person. You play as a human in an Avatar interacting with the natives. I'm guessing single player story, but multiplayer might be a possibility. Maybe even the ability to fly or drive various craft or those ride various creatures.
From James Cameron
So different biomes.
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Something like this?
[video=youtube;KHPPahbt2Ig]https://www.youtube.com/watch?v=KHPPahbt2Ig[/video]