Sorry for doublepost, but I just noticed something else...
When I left home this morning, my platinum arena deck had dropped out (>500 rank) with -106 rating at a 2-3 record. Right now, it still has the same -106 rating and 2-3 record, but it is somehow rank 379. Now, I realize that other decks could have lost and mine could have floated back up into the top 500 again. However, I've been keeping an arena thread for as long as the arena has existed, and so I've seen a lot of numbers and stuff, and I guarantee you that this isn't a statistical anomaly. Either a whole bunch of accounts have simply disappeared, or some sort of arena exploit is being used to win every time by someone/some group, or something like that.
Anyway, I guess my question is... wtf is happening to arena?