Well first like everyone else said the instance info should NOT be available for several reasons.
1: it would handicap this exploit
and
2: teams should be be able to skip maps they aren't maximized for. This is just the same as being able to tell what classes you are about to play, before the game starts. It's an exploit and should not be allowed. Arena is about being better at your class spec/combo than your opposition and being able to adapt and win. Not skipping a map or team because you might loose.
Secondly, they should penalize teams that don't join arenas. Your partner keeps disconnecting?? Too bad. That's not the fault of the team you just made wait 8 minutes for an empty arena. Get some better internet maybe

Ya sure it's a bitch when it happens to you, but so is life. In the next patch if you get glitched out of an arena map (fear, scattershot, blind etc) and fall through the floor, you will be killed. Is that fair? No, especially since it was the other team that bugged you out threw the map (at least in 99% of the cases it is).. but once again that's life.
If your team member is disconnecting 7..8 matches in a row/night.. then chances are you aren't going to be sitting at a 2.1k rating anyways so what's the big deal?