Tsukuba is very nice, too bad we wont be seeing a wet\rain version(so far).
HOwever the RX7 video left a sour taste in my mouth because of only ONE thing, when drifting the smoke from behind(as seen from the front) the car is extremely pixelated when blending with the car model, from behind its not an issue, but from the front you can see huge blocks of pixels until the smoke evaporates.
Around 0:25
http://www.gamekult.com/video/7929820/
Theres also more disappearing scenery in the Course Maker tracks. This seems to be a common issue among Course Maker tracks(previously in the Eifel video, a mountain pops up)
Watch the Grandstand disappear.
0:51
http://www.gamekult.com/video/7929822/