Scorpio wont do native 4K in most of the games, my opinion

[Barozi]

It will do most games in native 4k because most games are indies and they are already running at 1080p on X1.
Other than that they already said they were aiming to get every 900p game up to 4k. Obviously they know what hardware needs to be put together to make that happen.

""As we landed on 4K, Andrew [Goossen] and team did a pretty deep analysis," Gammill continues. "We have this developer tool called PIX [Performance Investigator for Xbox]. It lets us do some GPU trace capture. He and his team did a really deep analysis across a breadth of titles with the goal that any 900p or better title would be able to easily run at frame-rate at 4K on Scorpio. That was our big stake in the ground, and so with that we began our work speccing out what the Scorpio Engine is. It's not a process of calling up AMD and saying I'll take this part, this part and this part. A lot of really specific custom work went into this.""
http://www.eurogamer.net/articles/digitalfoundry-2017-project-scorpio-tech-revealed