It's possible that only a select few people on the team are working on the maps, the others work on the next game/project. I personally think they want to delay the release of this map pack, no point releasing it straight after the first one. Wait until the hype is gone and people have got bored, then sell them more crap.
Seriously people who buy these map packs deserve to be ripped off.
They blatantly finished all of the maps when the game was released and decided to hold a couple back to release as staggered map packs to make more £££.
Well i wonder how many people have actually paid for the map pack? I hope no-one!
MW1 is what brought me back to quick fix PC gaming. But after no dedi servers for MW2 i wouldn't pay £10.99 for the maps and never will. And hopefully the community think the same and Activision sell Zero map packs.