I doubt you'll see a RT6, even 3 months before the RB6 was released you couldn't even get RT5's. RT5's have been "backordered" for a good year due to the lack of interest in 2wd Stadium truck. I left Kyosho just as the RB6 came out, I tried one, it was good, still new, but went back to my 22. I think anything that Kyosho comes out with will be awesome.
Andy