I think I read somewhere else they were having issues with getting it to have consistently stable tuning (or something like that), and so didn’t feel happy going out to retail with it. Seems plausible.
Personally I would have liked an expander for the Grandmother with an extra envelope, LFO (or two), and a delay – that would have been sweet. But I guess that won’t happen with the Matriarch now. Hmm, with this and the new UDO Super 6 there are some quite GASsy synths around!