I bought the DLC and played for a while tonight. The new class is pretty sweet. I had a few moments where I hacked a turret that the enemy team didn't suspect was about to be hacked and it just started shooting at them like crazy. It "respawns" the turret, so if if is already damaged or doesn't have a lot of time left, it seems to give you a full round of ownership.
I also really like stealing abilities. Since I'm always being a little trophy whore, I never have the sprint ability in my loadout as assault. But multiple times tonight I was able to steal that ability and grab beacons for nice captures. It's also cool to be able to steal a spawn or turret ability where you can put it down and it's not your permanent loadout.
The new pulse emitter is cool too but I didn't get to use it very much. I put one near a beacon drop-off point where an enemy had a turret. I think it disabled the turret since I got credit for something (it was hectic and I wasn't really looking at the notification).