Milestone has just confirmed SBK X will arrive in the USA on October 19th.
"Hi there USA- based friends, こんにちは (Konnichiwa), Japanese fans! We’re happy to announce that SBKX is coming to your stores very, very soon: 14 October (Japan) and 19 October (USA) will be the days.
Here are some details: in the USA it will be distributed for PS3, Xbox360 and PC, while in Japan only for Xbox360. We’re happy to announce, too, that all the console versions will have included on disc, and for free, the “Legendary roster” that in the european release is a DLC add-on!"