If it's not going to have Denuvo I don't know why they'd specifically delay a GOG release. What, they think Steamworks or something is going to offer protection? LOL. Kind of stupid if you ask me.
I'd buy it day one if it comes, but I'm totally fine with a potential delay. I got too much on my plate as is, and even more coming to GOG.
Saints Row: The Third Remaster (should be coming next week to GOG since Epic exclusivity is ending on May 22)
Biomutant (May 25)
Solasta: Crown of the Magister (leaving Early Access May 27)
Edge of Eternity (June 9th)
All day one buys, and I'm sure I'm missing a few titles. Plus there'll be the Summer sale coming at the end of May or Early June (May 31 possibly).
My guess is that the delayed release is not due to copy protection but due to some technical reason.