If New Orleans must get rebuilt on the scale that most people expect, then the landscape will end up totally different. I would be very surprised if parts of the city aren't raised, perhaps the greater part. Regardless, there will be substantial land set aside for parks, cultural activities, and public buildings. That's what I expect. The complexion of the city is likely to be totally different.
Of course, mine is the most optimistic view, but the precedents are supportive when looking at other large-scale planned communities in the U.S. and around the world. I suppose it's possible that it could all be a fiasco, but I doubt it.
And, for what it's worth, the political landscape as well will be forever changed in Louisiana. I expect it to become solidly Republican myself.
Whatever you're on, I want some. :)
I think they should just flood it and build a massive stilt house city.