Keeping in mind that I have no idea as to what the 'new Amiga' is supposed to be good or excel at, here is my own serious reply:
1. Given the choice between the two, I'd probably go for ATX + custom PowerVR graphics chipset. It's less complex to design, and has well-known form factors. Personally I'd want a micro-ATX form factor. Small, lean and mean.
2. For now, AOS4, by a small margin. Personally, I'd opt for AROS: the project is community-driven meaning that the use of closed-source, proprietary software would be difficult to say the least.
3. No Zorro-slots, not even as an option. Zorro is woefully inadequate and outdated. It served its purpose at the time, and should now be allowed an honorable retirement.
4. No special-purpose connectors whatsoever for common input peripherals. I want to use stuff which doesn't give me RSI, and I want to have a healthy choice in models too.
5. PS/2 and USB. PS/2 is considered to be 'legacy' but I can live with such a small connector (or two).
6. No special-purpose input peripherals whatsoever, save for, perhaps, a game pad or game controller. Stuff breaks down, and there's a far better choice in PC-style keyboards (My mouse and keyboard are wireless, for example. That's bliss---no more cables messing up my desktop.)
7. I don't know what the merits of each chip are, so I'm going to pass. Personally, I feel that a graphics chip(set) should be backed by a manufacturer who doesn't require you to sign an NDA in order to get developer documents. This is not because I'm an open software proponent; it's just far less hassle in a community project.
8. Puh-lease. The Real Next Amiga is going to be fitted in the custom designed shell of an Imperial Destroyer (see
here) or, for those with less time on their hands (like poor Bloodline) a Millennium Falcon (see
here). Now
that is a case I'd love to have on my desk!
9. 500 dollars max.
10. You can't use the name 'Amiga' for obvious legal reasons. That's a sad fact of life. So instead choose something new and snazzy. I don't know a good alternative, but let me ponder for a while.
11. Bad idea, see 10.
12. The kind of company with way too much cash to spare, a soft spot for the old Amiga, and a desire to do something completely whacky.