Man oh man. XP was crazy!!! Game was super fun. Couple things you guys may not of heard. Number one Prestige shop. You get to choose what your reward is after every prestige. Here is the list.
Extra Custom Class
Reset All Stats
Double Weapon XP
Title and Emblem 1
Title and Emblem 2
Title and Emblem 3
Assuming you can pick extra class 5 times and the rest once.
Number two is perk combos. Didn't see any actual examples of this but it looks like when you pair certain perks together there will be other small advantages.
Any questions? Shoot. I retained as much info as I could but it two hectic days.