If you take a look at the Modern Warfare 3 pre-order information, you'll see that both the PlayStation and Xbox versions of the game are marked as "cross-gen edition"  meaning that you'll not only be able to play them on last-gen consoles, but you'll also have access to the latest version at no additional cost if and ...

Call Of Duty Will Still Be On PlayStation\n\n A tweet from Xbox CEO Phil Spencer announced that this would not be the case with Call of Duty as Microsoft and PlayStation have signed a binding agreement to keep the shooter series on PlayStation following the acquisition of Activision Blizzard King.

Activision has been chargingR$70 for the current gen console version of Call of Duty for the last two years, but Modern Warfare 2 is the first time that price will extend to the PC. The PC has long been a holdout for arbitrary game price increases.

'Modern Warfare 2' is jumping on the price hike bandwagon  and players aren't happy about it. Unfortunately, the simple answer as to why MW2 is set at such a high price is that $70 has become the new standard for triple-A games.