Content Collection 2 goes to Xbox for general purchase the 22nd of May. It will consist of the April and May premium content:
-Getaway (Face-off map)
-Lookout (Face-off map)
Spec Ops missions:
The new game mode Face-off has two maps free to everyone on May 15th:
Call of Duty video
I think it's pretty safe to assume a 4 week delay for PS3 - the two Face Off maps will go to all PS3 players the 14th of June, and Collection 2 will be available to all PS3 players for purchase the 21st of June.
PC players will possibly get Collection 2 July 10th if it's another 7 week delay from when Xbox gets it.