"This better be coming state side" is all I can say right now.
Hell, if Yakuza 3 is able to come state side, then this has a fairly good chance of it too.
There's really only two main things that would have to be addressed, prior to any Western release.
1)
Legal Red Tape (if any). Hokuto no Ken/Fist of the North Star has been a property that has changed hands multiple times in the West, thanks to various iterations reaching over here. If at least one of those parties still holds any measure of rights to Hokuto no Ken, that could be something that Koei Tecmo would likely have to contend with. Unless they could some how work something out, like Capcom did for TvC...
2)
Will a HnK game sell? Lots of people like to swear up and down that they love HnK. But, really, the series has never made much in the way of head-way over here in the past. The Manga Entertainment DVD release for the original series didn't do well, and Raijin Comic's attempted marketing for both HnK and Souten no Ken also flopped (among other things). Thus, there really is NO precedent to give Koei Tecmo the "incentive" to think Americans will really care for a game starring Kenshiro and pals. Fundamentally speaking, a "Hokuto no Musou (Tensei)" game would have even more odds stacked against it, than even Gundam Musou did. At least most Americans can relate to Heero Yuy and Zechs Marquise.
If any thing, maybe it might be better to hope that there are plans to release the game in Europe. HnK has always been popular in France and Italy, to say the least....