WM steam is a niche market at best, particularly for a loco with a design that was pretty specific to the WM. As far as I know, Weaver is still your best bet at this point. And if they do it, it will be off their Wyoming loco now on the market. Unfortunately, don't be surprised if the Weaver Potomac is a Wyoming dressed in WM livery. That would be close but the rivet counters among us may not be happy.
Poppyl