This is a good thing if it's true. Hurricanes do not maintain cat-5 strength for very long. Katrina, Ivan, Floyd, and Gilbert all peaked briefly above the 150 mph mark and then weakened before making landfall. Andrew, Camille and the Labor Day Hurricane peaked just as they made landfall. The forecast is that Rita will weaken as it moves out of the super-warm central gulf and hit Texas in the 145 mph range (which is still pretty bad).
Right, Andrew intensified very quickly, just as it reached landfall. It was Cat5, plus the relatively quick forward motion (20mph) that made the winds in the northern eye wall so bad. Knocked down some concrete block structures..
I am from that part of Texas and have vivid memories of what Celia did in 1970. My family has a cabin right in the projected path; we can probably kiss it goodbye.