From the VA site on January 20, 2011 10:00 AM
Effective January 1, 2011, DoD adjusted most housing rates. VA’s housing payments under the Post-9/11 GI Bill are based on the E-5 with dependents level for the zip code where you attend school. The DoD rates changed in January, so if your housing rate went up, you will see it in your February payment. Your payments will update to the 2011 rates automatically.
If your housing rate decreased for 2011, you will continue to receive the higher 2010 rate unless you change schools or have more than a 6-month break in school attendance.
You can see the new rates at https://www.defensetravel.dod.mil/site/bah.cfm