To feed your speculations:
Rockstar is hiring a Gameply Designer with qualifications that include:
"Advanced physical and digital prototyping skills to establish the pillars of the asymmetrical cooperative stealth experience required."
http://gamrconnect.vgchartz.com/thread.php?id=208686&page=1
Nintendo is selling their IPs to Microsoft and this is true because:
http://gamrconnect.vgchartz.com/thread.php?id=221391&page=1