I own several Behringer synths including a Deepmind 6 for which there was also no official user manual for the first 6 months. In the meantime I had to make do with the manual for the Deepmind 12.
Your situation sounds a lot like mine.
Just Download their Model D manual and use that in the meantime until the Poly D manual comes out.
It may take 6 months to a year so just be patient.
Even here in Canada the first Poly D units are still on backorder from the factory so there really shouldn't be all that much rush about it.
Gary