http://betsofbitco.in/item?id=1258 is the bet.
Apparently before the fork it was around 5 - 20 with 5 in agreement and 20 disagreeing but after the fork it raised to nearly 80 - 70 with 80 in agreement, but only thing is the price didn't close at $5 down at the end of the day since the drop happened around 2-3 AM on Mt. Gox.
Seems to me whomever bet on disagreement (Red) is going to win big time...
Hmm. Could be interesting way to hedge the risk of a crash.
Me wonders if the owner will pay out though.