So you're not a MS fan? Really? I wouldn't have guessed it myself! I don't really understand -and probably never will- why is it so important to you that PS3 games sell more than X360 exclusives. I don't know if Sony pays you for each game they sell but I don't get why the hate on halo since it's overall a great franchise and a big part on why the shooters are what they are today.
OT: I think the X360 version has a good chance specially considering the release date, but the PS3 version? Extremely unlikely.