Words on the street there's an arena addon out there that let you see what classes you're up against before the gate opens for the arena match to begin. Any experienced arena player out there can confirm this? What's the name of the addon?

proximity i believe

It's Proximo, but that addon does something else entirely, because an addon that can see who you're against would be outlawed by Blizz.

EDIT: Well, maybe it would still be allowed. IDK.