Well after coming down from my initial excitement... I kind of realized that this is going to be the exact same as the previous entries. New guns (but they'll feel the same as the last), new maps, same gameplay, few new perks (similar to current), new kills streaks could potentially be very different, and new interesting equipment.
It's definitely a step in the right direction for changing the game up. I really wish they would just do a game every other year... It's not like it wouldn't continue to be popular until the next iteration.
I hope the the linearity comments are true and it will be more non-linear than previous games. Could make all the difference.