Call of Duty: Modern Warfare 2 - Aliens ?

I have been hearing from the internet and from friends about some ideas concerning Nazi Zombies being removed from CoDMW2, which is great, because it would make no sense. The has also been some information out there about changing the enemies to aliens, still keeping the same type of concept as Nazi Zombies. I think that this would be a great idea and would fit in well with the game. We will keep our eyes and ears open and post any confirmations on this. Cross your fingers for Call of Duty Modern Warfare 2: Alien Invasion!