With Supercar Concepts 3 just a day old, are there plans for another installment besides the movie Supercar Concepts X which is coming this winter?

The answer to that question is YES! There is going to be another Supercar Concepts after Supercar Concepts X. Two actually. This winter(2009), we will be premiering Supercar Concepts X. In 2010, we will premier the next SC movie, Supercar Concepts 4 is what it will be called. Later in 2010, there will be another Supercar Concepts movie. However, we are not releasing the title of it yet. The trailer for Supercar Concepts 4 will come out later this summer, a trailer for Supercar Concepts X is coming this summer too. The other Supercar Concepts movie we mentioned above, a trailer will be released later this year.

So to make things more clear:
Supercar Concepts - came out August 22, 2008
Supercar Concepts 2 - came out September 6, 2008
Supercar Concepts 3 - came out June 4, 2009
Supercar Concepts X - coming winter 2009
Supercar Concepts 4 - coming early to mid 2010
Secretly titled Supercar Concepts - coming late 2010