The Turtleflage vehicles did come out, but not until the line was all but dead. I don't remember ever seeing these anywhere but KB Toys where I ended up buying the case. In addition to the limited release, for some unknown reason they didn't even do an evenly packed case. They had 4 of Leo's Blitz Cycle and only 2 of Don's Hydro Skimer.
You can see some pictures of them here
http://www.geocities.com/tmntman/vehicles.html
And if you want one of my extra Blitz Cycles, let me know.