So, I was looking around on youtube for some black ops 2, and I found some gameplay from people who got the game early. It was combat training, because the multiplayer servers weren't up yet. You can play most of the game modes in combat training instead of just TDM and FFA. The killstreaks do look a bit OP. It looks like when you get your 3rd streak, you can use that to get your first streak again. For example, if dogs are your last streak, the kills you get with the dogs can help you to your first streak again. Hopefully this isn't like mw2 with streaks constantly up in the air....