A long time ago, July 15 to be precise, IW_JRandom (an Infinity Ward employee) at the official CoD4 forums promised some special love for the PS3 version of the game. Speculation has been rife about what it could be with demo's, CoD 2 on the disc and more as rumors.
IGN lists the PS3 versions European release date as 2nd November instead of the earlier 9th November. They still list the US and AU release dates as 5th and 7th November.
The Xbox 360 and PC release dates are as earlier PS3 ones, EU 9th/US 5th/AU 7th.
Source to promise from IW_JRandom : http://www.charlieoscardelta.com/board/viewtopic.php?t=10494
The source to IGN is for the release dates and the source to the official site is for the promise.