So far SynthV 2 details are scarce, no formal release date has been announced and the last official information I heard was that they were holding release until they were happy with a few of the new features. Vresion 2 voicebanks have been used in demo songs but notthing beyond that, they were existing names so may be just re-engineered for v2.
I have seen nothing about German vicebanks anywhere from any source, just user’s wishlists for future products.
As for voicebank format, only Dreamtronics have that information so if you are suggesting creating your own…?