The satellite imagery firm Digital Globe, which supplies much of the satellite data in Google Earth, has announced that they are working to bring updated imagery of the areas devastated by Hurricane Katrina. From the announcement:
DigitalGlobe, Google and GlobeXplorer (www.globexplorer.com) are working closely to provide the updated imagery via Google Maps, Google Earth, and the GlobeXplorer suite of products including ImageAtlas as quickly as is possible.
As soon as this data is made available, I will post an announcement here at Google Earth Blog.
See this entry for a video of the demolished region tied to placemarks in Google Earth.