That's pretty neat.
Is it possible to upload disk images to it?
The only cost is the developer account, no subscription or anything?
Can the series S do this?
Can I use my DS4's for it?
I currently have a hacked PS3 for emulation, but I could see myself buying a series S solely for this purpose.
My biggest worry would be that microsoft would disable this for some reason since they would lose money on selling the series s below cost and me not buying any games, but I guess I could sell it on if that happens.
Lemme see what I can answer:
1. By disk images do you mean installing a whole new image onto the console? If that's the case, no.
2. Yes, only the 20$ fee.
3. Yes, all Xbox One and Series consoles can do this.
4. No, you are still limited to the Xbox environment so other controllers won't work (welllll... there might be some exceptions but i haven't seen any).
And no, dev mode isn't going away—it's necessary for a lot of indie work, games and applications :)