As far as I know, It was released to a few toribash players (Mod, nabi staff ect.) but not to the wider public.
It was put on the back bench while toribash Wii was being made. In a simi-recent interview hampa said somthing along the lines of "I hope to be able to release (Glitchracer) at some point in the future.
This means that in is not likly to be released untill the wii virsion is done and bug free and even then there is still A chance that hampa will choose to not release.
Long story short: Toribash wii
first Glitch racer
later