There is no way of telling who you are up against aside from playing a guessing game on their armor.

Wouldn't it make sense to (and yes, I am taking this from WoW) show a separate party UI which shows enemy players? Of course this will only be available after the arena starts and not during the 2 minute ready time.

OR

Substitute the god awful name "Fresh Meat" with the players corresponding class.

Better coordinated attacks.
Faster reaction timing with targets.
Makes up for useless tab targeting.
PuGs will find it a lot easier and more enjoyable to play.

Meh, just my 2 cents.