Metal Gear Rising: Revengeance as a series, as well as his continuing relationship with Platinum Games.
"First of all, I'm not a huge fan of spin-offs," Kojima said. "But as far as Rising is concerned, if it works out well, I'd really like to work with Platinum again to make a sequel."
Kojima also said that he'd "really love to make" a game with The Boss as a main character, but that it would be part of the main series if it were to ever happen, rather than a spun-off title like Rising. Kojima couldn't comment on whether Platinum Games would be involved with that game's hypothetical production, only that he's "really loving working with Platinum."