This whole newcararrival routine is fascinating to me, and it seems mostly bollocksed up. Yesterday a salesman at Irvine Mazda said they still hadn't received all their first allocation vehicles, and I believe they are all still at the port.
I'd suggest putting money down on what you want and then canvass neighboring dealers to look for any orphaned 8s...preordered cars that people have backed away from for some reason or other.
Also check out the MazdaUSA website, click on RX8, then search inventory. Somewhere along the line the site will ask you for your zip code, just do as you're told and noone will get hurt. You can then search the local dealers for cars that will meet your wants.