A pitch-tracking ring mod, very cool.
Having owned a Pigtronix Mothership and wanted the tracking ring mod to be separate, this may be wish granted.
My worry is that the Vitruvian Mod's tracking carrier seems to be restricted to harmonic intervals -- a lot of the joy of the Mothership's intelligent ring mod was the harsher sounds you could get by dialing in some random non-harmonic interval that got you weird dissonance + sub notes. Weird to say about a ring mod, but I really hope this doesn't come out sounding too pretty. Also, I hope Subdecay built the tracking to handle bass too...
That said I'm already GASing for this pretty hard. No idea on a release date though. Preview (mostly guitar). Manufacturer explanation.