1. No, the maps are not out yet.
2. The maps will NOT be free, or $15. They will be 800 points on the 360, and around $10 on the PS3, same as every other map pack ever released on both systems.
3. Treyarch and Infinity Ward trade off every year because Activision wants to give Infinity Ward enough time to make games as damn good as CoD4. I'm sure when CoD5 comes out, and is basically CoD4, but set in WW2, most of us will be blown away by something about the game and want to check it out. If not, we can just wait for CoD6.
4. Not that important, but the pics of the maps are for both the 360 and PS3 versions of the game.