As I said, we never went to prototype on them, though: I came up with the design -- it's a bit like the Matrix in terms of its complexity -- and I executed a basic proof-of-concept mockup, but then other things took precedence in the production queue and they got put on the backburner. Then the business sold.
As it happens, I was actually talking today with another manufacturer about dipping into my pool of unborn designs. He was specifically after two other products -- also cool things, one for the XK and one for the WK/XK -- and I haven't had time to even contemplate where it all might lead. So give me time ... or give me an offer I can't refuse.