I'm not expecting much from the interior show scenes at Radiator Springs Racers. I think those that think it's going to be some sort of Indiana Jones Adventure type of quality have drunk too much of the Kool-Aid.
They built the real Radiator Springs out in the land, that acts as the pre-show for the ride. From what we've seen leaked on the Internets officially and unofficially, the Racers show scenes appear to just be a short section of flat track past blacklight plywood flats with a few projection/lighting effects and some static Cars characters with speakers behind them spouting out random dialogue as your car goes by. Radiator Springs Racers indoor portion is just sort of a newer version of Mr. Toad's Wild Ride, in a bigger building because the ride vehicles are bigger.
I think most of the money for Radiator Springs Racers went into the 180 foot tall Cadillac Range and a bunch of eye candy to hide Anaheim from the park once and for all. Any type of very modest dark ride experience inside the building is just a bonus, and I don't expect much personally.
That said, I've been on Journey To The Center Of The Earth a half dozen times or so in the last 7 years. It's a good ride, but the Lava Monster is the big thrill and the rest of it is just sort of pretty rocks with some very basic animation. The high-speed portion is a quick acceleration in the dark out of a cave, with rather mild thrills. The pre-show and queue is just as good, if not a tad better than, the actual ride.
