The PSN update is around 6PM EST. Be patient.
No there were only two stimulus and resurgence
This confused me for a second, but I got the answer. The resurgence is only a map pack for the online multiplayer, not campaign.
I believe it is in mid-June for X-box, not entirely sure though. There is a Call of Duty: Modern Warfare 2 - Resurgence Pack released June 3 2010 for the PS3 and Xbox 360 for the second Map Pack. see related link
Stimulus Package, "Resurgence Package" though they are far from being new now
As you play regular matches, when you play matches with a map pack purchased, you are allowed to play that map in private matches and other game modes.note: you do not always verse people on that map it will also be other map packs or maps which do not require purchase.
Two different map packs were already released the Resurgence pack on June 6 2010 and the Stimulus on May 4 2010
Yes, downloading resurgence map pack will not interfere with the stimulus map pack.
I have heard that the new stimulus map pack for the ps3 will come out a month later than on the xbox 360 which is around April 30th The Resurgence Pack is coming out about a month later than xbox360 and xbox360 comes out June 3rd.
There is no current release date for the modern warfare 2 map pack.
Buy it in the map pack
march 30th
Rumors say that a map pack will be available either March or April.