Things to watch:
(1) How many people come back? People are buying houses in BR, staying in Houston, and the NY Times reports that up to 250,000 people may stay away from NO.
(2) what does the government do with the structures of the city? Are the poorest areas bulldozed and rebuilt? Are they left to rot? Is there massive condemnation?
(3) Remember that this could happen again.
As with anything else, there will be deals to be had. Every deal I've made has been the result of being "on the ground", talking to people, and catching someone at the right time. I'll go to NO and look around, but not for a while - maybe a year - because I want to see how this plays out...really plays out.