Very nice. I like the size and simple direct architecture. But a $2,000 price tag and only one LFO?
There is apparently a second, simple LFO at the bottom of the multiples section to the right. It features only triangle and square outs, so that one might be used for vibratos, tremolos, or trillers. I'm not sure, though, whether it's on instantly or whether it can be controlled via mod wheel as well - that might be patchable. Hidden in the left multiples section is also a ring mod function.
The price certainly appears to be on the steeper end, but then you couldn't build such a system in Eurorack for that price. Given that Moog is selling a strictly limited edition of the MF-104 delay for almost a grand right now, the inclusion of a modulatable stereo version almost seems like a bargain. Plus you get a 49 keys Fatar keyboard, which isn't cheap either. Add to that the 256 step sequencer that includes ratchet now and the ability to record up to four notes per step, linear FM and PWM for all oscillators and the capability to hardsync up to 3 oscillators to the first one, a stereo LP filter with spacing option (just like on the Voyager) and a HP filter both with separate controls, and 90 patch points. So this isn't simply an upgraded Grandmother. They catered to almost all user requests and added those to almost twice a Grandmother. From that perspective the price doesn't seem too high anymore.
There are two ways one could think of the Matriarch I think: One would be Moog's version of a Korg Mono/Poly. Apparantly it is said to cycle through the oscillators in sequencer mode just like the Korg.
Another way to look at it is as a powerful analog mono synth and a more affordable alternative to the Minimoog. Its features of course go way beyond the Minimoog, but it might also be regarded as an alternative in terms of sound. While the Grandmother (I mention that one as it's already out there) doesn't sound exactly like a Minimoog, it does sound different to the Sub series and certainly the One. Its appeal is that it gives you some of those old Moog modular circuits which have been recreated at a fraction of the usual price thanks to SMT. So, for purists or those who crave the older Moog sound, the Matriarch could be a true alternative with a fairly large keyboard.