I went to the Warpspeed chasis for my tc3, worked just as well (if not better) as a tub with all the mods done to it, not to mentaion a much nicer look and way less work.
About the tc4, it will get here eventually, and it wont be any faster if we all wine about the wait, so lets all just dream about it untiill we get our paws on 1.....or 2.