I am super excited for this. The new create-a-class system is going to be fantastic. It allows the player to choose whatever he/she wants, as long as they have enough "points."
Also, I think it's a bit funny that all my friends I mention this to are like "omg this game sucks. it has aliens in it and it's a total ripoff of halo lol don't waste ur money on it!!!"
It's only 13 years into the future. Come on.
Oh, and btw OP, no it won't be [exactly] like CS where you equip the knife, but more-so like BF3 where you press a button and you can hold the knife.