Indeed, Astral Chain seems almost a certainty, and the partnership between Platinum and Nintendo appears strong; by all accounts, they work well together.
Presenting Platinum's F-Zero: Stylish Racing Action Game, with bonus brawler/bounty-hunting segments that can be unlocked.
Because I'm inclined to agree: You can make something separate with Captain Falcon, but it's not F-Zero if that's the only connection. F-Zero is the racing.
I'm not sure what Platinum's Stylish Racing Action Game would look like.