I just read that DLC for Modern 2 will be released on Xbox 30 days before the PC/PS3

I know that there's going to be new map packs for multiplayer. 
 
Does anyone know if it will be just new maps?  Will there be a new mission for single player, new game modes for multiplayer, or anything like that? 
 
The reason I ask is because I read a while back, that there was going to be some new multiplayer modes added. 
Just trying to figure out if it was just a rumor.

People have been playing Thermonuclear Warfare on youtube (which looks like a cluster fuck of grenades and dying) so it must be on the disk. 
 
I would really like a map pack with maybe a few MW1 maps and a few new ones. But because people will buy more, if Infinity Ward does do that, it will be in two packs.

It will probably just be new maps. In CoD4, when they added new game modes in multiplayer it was done in a game update. However, it would be cool if they added more Spec Ops missions.

They really should add more Spec Ops missions. It's the best mode.

I should definitely get back in Modern Warfare 2.  Damn you, Mass Effect 2!