I just started playing Forza 6: Apex on the PC and it has no trouble maintaining 60+ Framerates with all of the graphics settings maxed out and 4K resolution. It looks incredible to me, the amount of detail and the smoothness is way beyond what I'm used to with GT6 on a PS3 and definitely beats PCars on the PS4 by a large margin.
Hardware Setup:
Dell T3600 E5-1620 Xeon@3.6GHz, 16GB RAM, 635W PS, 1TB Samsung EVO SSD, Win10 Professional, GTX-1080Ti
LG OLED55B6 4K TV
Thrustmaster T500RS
Unless Scorpio is relatively cheap I'm not sure where it's niche is. A PC running Win10 has a lot more flexibility and at current spec is a lot more powerful than what I've seen of the 'available sometime in the future' Scorpio specs. I was able to keep the system cost to around $1400 by starting with an off-lease T3600 from ebay ($360) and then adding SSD ($300) and 1080Ti ($699).