After browsing some of the Japanese sites, I read about a new version of
the HD-HLAN series of Linkstations. If I'm not mistaken, this is the
same series that's in the US right now except at ver 1.
Anyway, HD-HLAN v2 has a MIPS CPU (IDT R3000 core) in it instead of
the usual PPC. This seems to be true for the new 54g wireless
Linkstation that just came out in Japan.
Although this shouldn't affect the hackability of the box, I figured
people might be interested in knowing this. Perhaps Buffalo might
release v2 in the US too, or even the wireless version.