It looks like this:

In a nutshell GeekHack brother ezrahilyer is looking at the feasibility for reverse engineering the chips in order to make a USB converter. So you will be able to use official Thinkpad keyboards on your computer!
However(!)
Here is a photo of the inside:

If someone in the community has one of these - can you take some photos of the chips. Need clearer photo of the specs/model # on top of the chips.
Unfortunately I bought/sold mine a long time ago. I was frustrated that I couldn't get it to feel like the real deal.
