The Census Bureau released some new estimates last week for the Hurricane-affected states and counties. One set of estimates shows a 345K loss for LA and the other set shows a 380K loss for LA. Orleans Parish is estimated to drop 280K (64%), and St Bernard Parish drops 61K (95% !!). Baton Rouge picks up 17K of that population.
Texas is claiming around 40,000 additional school children related to Katrina, so let's maybe multiply by 6 to to get around 250,000 extra persons assuming a fairly normal population distribution. Texas was reasonably close to a 33rd representative in 2000, so perhaps this would be enough to push the state closer to 36 than 35 in 2010.