Will my Elite membership get me the map packs for free in Black Ops 2?
No it will not. You will have to buy the seasonal pass for $50 to get all map packs for BO2 or pay $15 per DLC release which ends up being $60.
Your premium membership is only for MW3.
But when I try to connect it when I'm in the multipayer menu, it says account name. What's that?