I would be surprised if most of the first party games don't get at least a simple patch, apart from old forza's and horizon 2, and couple others. If I was them I'd even try to get some of the third party exclusives patched up, ryse, qb.
lots of games have pc versions to get assets from, etc.
it's a simple way to somewhat show the difference and have Scorpio patched games at launch, without having to invest too much. May actually be offset a bit by sales, as many under performed, but I suspect some people would pick them up. Not saying will suddenly sell millions.
I think Halo 5 and will likely be more than a simple patch for Scorpio...probably be a full uwp version getting rid of esram optimizations and reworked for new memory system...also wondering it will have there will be a PC version released as well. Gears of War 4 probably in same boat...
I'm a little skeptical older forza's will be patched...if only because they seem to be on yearly release cycle now anyway. So Forza 7 out this year will likely be built for Scorpio anyway. Although Forza Horizon 3 was a uwp game so maybe that thing is already running on Scorpio devkits.