It never "was" National, Steve; it's a new class for 2011. Are you maybe thinking about STU? STU will retain its National status in 2011 (it was the 10th most-entered National class in 2010). There was a short handful of us that ran Nationals and the Runoffs in 2010 in STU, though we got our asses handed to us by full-up World Challenge cars...
If you build a car to STL rules, you can run Regionals as STL and/or STU, and the car would be legal (but not competitive) to run Nationals and qualify for the Runoffs in STU. That is my plan for 2011 (though I will likely not go to the Runoffs.) I know that Kolin Aspergren is planning to run Nationals-Only in the southeast with his ITA Neon...
GA