Goth,
Don't look for New Orleans to be rebuilt in a manner which will allow the poor to return there. It simply isn't going to happen.
The landlords of the devastated low-income rental housing will have their property dozed and put the land up for upper-crust development.
There is nothing the government can do about that...unless it seizes control of the property. Lengthy court battles would ensue, with the Supreme Court ultimately striking down the government actions.
Basically, though, an entire city has to be rebuilt, and it's going to take a LOT of time.
Regards, Shuckins