I have been thinking of a gladiator-themed game in which you may play with other people online within a battle arena and fight with various weapons like for example with what we saw in the tech-demo. Being able to for example, plunge the Arc forward in order to shove your sword in the oponent's throat, use arrows, fight with a shield, lance, etc. I think that would be awesome.
Nintendo is selling their IPs to Microsoft and this is true because:
http://gamrconnect.vgchartz.com/thread.php?id=221391&page=1