I won't have all the answers (either through ignorance or verbal NDA) but I did get some interesting info.
You've been upstaged by the RetroBlox guys themselves ...
http://retroblox.com/2017/02/08/everything-you-need-to-know/They say that they'll demonstrate it at a couple of events *before* the KickStarter, where folks can just bring along any-old-cartridge to run on it (VERY, VERY GOOD IDEA!).
If they can do that, then I'll agree that they've proved that it works, and my hat will be off to them.
But ... it's going to be locked-down, with an encrypted SD-card that will only run stuff that you directly rip yourself on the console, and carts that include expansion-chips (StarFox, etc), will always need to be physically inserted in order to run.
No installing downloaded ROMs or ISO images.
So they're avoiding the issue of piracy, and just punting it downstream to the Reproduction guys like Tobias.
The pricing bar has been set by their own comparision ...
We’re not confirming prices today, but we can tell you that RetroBlox, including 1 Element Module and controller, will be much less than a base Nintendo Switch, and additional Element Modules will vary in cost depending on complexity (both software and hardware), but won’t cost any more than a new video game. The final pricing will be announced before the launch of the Kickstarter Campaign in April.
So, I'm guessing that means $250-$299 for the base unit+1 module+controller, and $60 for each additional module.
I hope that's what folks are looking for.
For myself, it offers *me* little advantage over owning real hardware and a CRT, or just using an emulator running on a PC.
Anyone that's interested in the same basic hardware, but without the cartridge-slots or the lockdown, should be able to buy one of these in a few weeks (for $70) ...
http://www.cnet.com/products/asus-tinker-board/preview/