From Hornby America:
"We regret to inform you that all 2007 Scalextric NASCAR cars will be cancelled. This is due to licensing and team member changes that were out of our control. We deeply apologize for this disappointment. Looking forward to 2008, Scalextric is already working on a major project that will surely delight all slot car enthusiasts."
This announcement has been pretty widely seen already but I thought it was still worth posting. Many thanks to Greg from Houston for passing this along.