I think FFA will be better than QFB thats judging by the trailer and gameplay videos.
we'll see
EDIT: seems i was kinda right, Insomniac stated new, free maps will come over time.
Yes, you have a point there, though I'd known this for a few days now, I was kind of ignoring DLC. But if you want to include future DLC, there WILL be new free maps, and they could be on the same three planets, or on entirely new ones, who knows? I suspect it will be booth.
Well, There is a walkthrough, and it clearly shows the ice planet being present. And I've played the game, and the world I've come trough are:
>Korgon Refinery
>Temple jungle (can't remind the name)
>Plasma harvester
So it seems there are more than 3 worlds!