Thanks for posting these. Lots of very interesting stuff on this KB.
1. The PCB appears to be similar to that of the CM QFR, at least in that it's drilled for ANSI, ISO, and what appears to be JP (with the exception of the rightmost modifier, which sure looks like it's drilled for three spacings, but there's only traces for two. Not sure what's up with that. The switch is either mounted sideways, or has traces to be mounted upside down and a little over. This is likely due to be able to get it shifted enough for the crazy japanese bottom row.
2. Lots of keys under the PCB have space, leads, and holes for an LED under them. The "tab" (Numlock) has space for an LED, likely for the PC version to light up). This keyboard has a (ducky style) extra row of keys above the tenkey, in which one lights up. There are leads for two more, the one next to it, and the last one which is called (see #3) BT key. The CTRL on the bottom right also has leads for an LED. It's wired to the same traces as the capslock light. This certainly looks like preparation for a unix version, which I would certainly buy.
3. There is something labeled BT key on the PCB, with the possibility of an LED under it. Might matias have been thinking of a wireless version at some point?
---
The quality does look good from your pictures, the through holes are huge for those switches, which anchors them well. The soldering looks good, too. The flux has been cleaned off.
Anything I miss?