FFXIII first week sales will outsell Halo 3 first week sales, worldwide.

[Mnementh]

It may be possible, that FFXIII beats Halo 3 first week. PS3 should have a bigger userbase 2009, than the XBOX360 had back to the release of halo (13m I think). Also FFXIII is highly anticipated. I think it will become the biggest game for the PS3.