Namco now has a website (in Japanese) devoted to Ridge Racer 7.
IGN must have staff well versed in the Japanese language (or maybe they just translated the page. I’m too lazy to do that) because they reveal some more info about RR7:
The site reveals only a few details to supplement our preview from Wednesday. RR7 [...]
"Ridge Racer 7 Website" - 22.04.06