This was part of an auction in early December of last year with many items from Neil's collection. A fair number of items were odd-ball non-released prototypes such as this. (There were also a group of prototype Legacy hand-held units (just another example), IIRC).
There were at least a few of these up for auction (maybe 3 or 4?), all with the same note included in that auction regarding unknown functionality at this point in time.
Lionel showed one of these at York at least once many years ago. At the time the proposed name was "Yard Boss", I believe. Basically a ZW with a CAB-1 interface built in to the top so you could operate the advanced functions from the transformer.
Owning one would be cool, but I wasn't interested or serious enough about it to register to bid with the auction house. I'm also not serious enough to go for the one on eBay right now.
It is interesting that the current owner removed the top to show the electronics inside for the last pic.
-Dave