Great Op. Having heavily played every game in the series since CoD4 I'm excited by many of the changes in this game (non stacking KS, removal of stopping power).
One bit of trepidation I have after seeing the complete Perk list for the first time is with the 3rd tier. I foresee Marathon and Ninja being extremely dominate based on past experience. In MW2, I loved utilizing SitRep for it's Pro ability to hear footsteps. It was hard to unlock and offered a nice reward. Louder footsteps are userful in almost every encounter. This ability will now be easily attained by most players as they will be using Ninja (ninja was the most used 3rd tier perk in MW2 just for the silent footsteps). It seems really powerful to combine SetRep Pro and Ninja.