I'm excited about this hardware, and for one prefer to have the actual facts.
One thing I can say though that deeply saddens me about all these new Amiga clones is that NONE of them will work with old Amiga hardware such as the Toaster, SuperGen+, ChromaKey+, etc.
With that in mind, we are still witnessing the death of a large piece of Amiga history. When our original Amigas die, it dies. 
Amiga genlocking works on Natami. I expect external genlocks to work just fine.
We decided to put 15KHz RGB video output/input on a small expansion board to keep costs down for people who are fine with just having DVI/VGA.
Zorro cards is a different question. Natami is PCI only for now. Theoretically, a Zorro expansion could be made for the SZorro bus. This is not anything we will be pursuing ourselves, but we take care not to break the possibility of doing it. (AutoConfig-wise, etc.)