They just sell out of their initial allocations (whatever amount they decide to commit to) and usually get more if it sells well. These will most likely be distributed by Bluefin too here in North America. There will be plenty of these for everyone who wants one since they are mass produced. Even if you miss out this time around Bandai isn't going anywhere and has a track record of re-issuing things over and over again...
I might even just wait for the reviews before committing, but this will be hard to resist. I wonder if these will surpass the Yamato 1/48's? I never was truly happy with their delicate nature, lack of weight, and limited range of poseability. The design/engineering were always top notch and the details/proportions were always spot on though. While the old Bandai/Takatoku's were chunky and toyish they alyways had a satisfying heft/sturdiness to them and the plastic was nice and shiny (as opposed to the more matte/satin finish on the Yamato's). Hoping these new DX's are the best of both worlds...
Glad someone posted the scale for these as I was unsure...