*Making my own Emblem, and putting it on my weapons.
*Hacking enemy equipment and killstreaks
*Currency to unlock weapon camo and attachments without having to go through time and effort.
*Changing the contents of the Care Package
*Jammers actually jamming equipment
Not much. They didn't really take a huge step for Zombies so I care less about it. I will miss the emblem creating, though.
Blackbird is back as a advanced UAV
The Blackbird couldn't be shot down, and it showed enemies on your radar, in real time. The Advanced UAV does not show enemies in real time, and it can be shot down too.
"Blackbird is back as an advanced UAV" implies that it's the exact same thing, but with a different name. As you've already been told, Advanced UAV is NOT real time, which is a big deal, AUAV CAN be shot down, also a big deal. Lastly, one thing you weren't told, is that Advanced UAV is countered by Assassin, where Blackbird could see you whether or not you were running Ghost.