Earn double XP and play with IW on the day new maps come out. When will they come out is anybodies guess.

Xbox 360 owners are already enjoying all the glory and excitement that is the new COD4 map packs. However, for us PS3 owners we are waiting the day when Sony finally releases the new Map packs that will contain 4 new maps.

While no announcements or release date have been given regarding when the new map pack will be availbable, Infinity Ward is already planning for that day. They will be having a double XP weekend where you can earn double XP points and Play with Infinity Ward where you can play against the developers of IW. This event will take place the same weekend the new maps are available on the PS3 network

Once again will that happen is anybodies guess.

Source