Call of duty modern warfare 2

There are going to be many similarities between COD4 and the new upcoming COD modern warfare 2. Instead of going on how they are the same, I will discuss what new things are going to be added.
First off, the campaign mode should last no longer than 6-10 hours of game-play. Which is similar to the other COD games. As for co-op, it has been downgraded from 4 players to 2 players. The co-op is supposed to be similar to the "mile high club" epilogue from COD4. You are now going to be able to duel wield hand guns, at least, in the campaign modes.
Now for playing online, There are going to be many add-ons. As well as the origional COD4 weapons, there is going to be even more weapons for each class. Now, instead of the 3 standard kill streak rewards, there are going to be 15 different ones that can be chosen by the player! Also, instead of getting nothing after a 7 kill streak, more kill steak reward spots have been added! For example, 4 kills enables you to recieve a supply drop, a preditor missile strike after 5, and even a strike from a gunship after an 11 kill streak! There is also and option to upgrade perks to a "pro version." It is still unknown what is meant by a "pro version."