Does the Superdome have an upper deck?
Whether it does now or not may not matter -- the Superdome could sustain serious damage.
I would say this storm could hit New Orleans with sustained 170 mph winds by landfall.
Add to the fact that Hurricanes usually spawn numerous dangerous tornadoes at the same time...
Jacksonville (MS), Monroe (LA), and Alexandria (LA) should all be safe places to evacuate to. Look for possible tornadoes from around Lafayette (LA) to Mobile (AL) and maybe as far North as Hattiesburg (MS).
The storm is quite large (area that the Hurricane currently has gale force winds and storm squalls).
I don't know if it will matter.
Take a look at this!
http://www.freerepublic.com/focus/f-news/1472323/posts?page=54#54