I'm willing to bet by the time Halo Wars debuts on the 360,
Microsoft or a third party will have announced a mouse and keyboard set
for the 360 exclusively for that game. It'd be an awesome profit
opportunity for other companies.
Also, I'm 100% sure in time it
will end up on the PC. Microsoft loves money, and with all the LIVE
Anywhere stuff, they won't shun an entire group of gamers. Remember how
they said Halo 2 was to be 'exclusive'?