So... The OP is the source or did I miss a link somewhere? Where did you see these dev kits?
Edit: ok, so he's not a dev and didn't actually see it and is going by what some devs said. Shame/weird that if they're willing to divulge such information they also couldn't tell him anything about its specs...
So I guess it may as well be bs, intentional or not, but there's a 50% chance it'll be done anyway and he's not 100% confirming it.
Quite surprise how important to have 2. I mean why not more than 2. If the screen rendering by hardware inside the controller, then let it have more than 2.
If it came power by the main system. Don't bother get more than one, otherwise the game may force to cut/reduce/limit for saving resource.
Are you using GAF with google translate? Anyway. No, it's not the controllers that render the game view on them. More than one controller shouldn't tax it that much more than regular split screen does in multiplayer games as they're not exactly HD screens, though they're extra on top of the full TV resolution rather than just that divided. Still, the problem seemed to be the video streaming feature and if it could handle more than one controller's screen iirc rather than anything to do with rendering.