It also happens to be developed by a semi-third party developer. The Gears Of War franchise is bound by an exclusivity agreement, something analyst Michael Pachter reckons Epic regret.
[quote]
“I think the Epic guys can’t wait until they can start doing multiplatform games,” Pachter said on Geoff Keighley's Bonus Round.

“I think that Microsoft has a contract to make sure that they get that sequel, but I think Epic regrets signing that contract. You’re up to 11 million PS3 in the US and probably a similar number in Europe, and you’ve got a 20 million addressable market with a game like Gears of War.

“I mean, that thing would easily sell 3 or 4 million on the PS3 and that’s a lot of profit.”</blockquote>

Pachter went on to state that it just doesn't make sense to do single platform development anymore.