As powerful as the Scorpio seems, I still don't think it'll run as well as the PC version. It's very much centred around DX12 and I highly, highly doubt Bungie have put a big push on that for this game.
Well,how PC version will run depends on your PC as well,you cant play 4K/60fps with 1060 or something like that.As for Scorpio-it sounds awesome and there is some short Scorpio footage already with Forza 6 running on 4K/60fps at just above 50% Scorpio power,but all depends on exclusives and price,i see no reason why D2 cant run on it at 4k/60fps since many devs already have Scorpio dev kits and had time to work with them,and as tech site said,work with Scorpio is very easy for devs.
Saying that - im waiting on D2 Beta