While the 2005 rule book has been released there are several things that were not changed that needed to be changed or clarified. The changes should be made today so if you have a hard copy of the book should refer to the online rules for the correct version. As for the 250 rules there was a freeze but it was removed due to the uncertainty of the 250 class as far as car count and the possable need to combine the Jr. class with the Sr. class
It is uncertian at this time what the numbers will be for the 250 class (SR and JRs) If the numbers do not warrant having two separate classes then yes they will be combined, but we probably will not know until play day