^Yeah I saw that, but when you Google Gears 5 on W8 and get nothing, I can't trust it if not confirmed.
It wouldn't be the only game that requires W10 if so, and MS certainly made W10 easy to acquire.
I recall when W10 first released, there were at least one or two titles that were initially announced as being W10 only. After an outcry from fans they ported in W7 support. We are now over 4 years into W10 now though, so don't be surprised if W10 requirement becomes more common.
On a side note, I was worried about updating to 1903, and now that I have, everything is running much snappier. Haven't tried it with games yet, but everyone I asked said the streamlining it employs makes games run better too. Just saying there are solid reasons now to run W10.