On Twitter XSEED has said:
"No news on a release for the GOG community, but we'll let everyone know if that changes!"
https://twitter.com/XSEEDGames/status/1400885259852472330
So if it comes to GOG, it certainly won't be on June 9th.

We tend to get lots of "AAA scraps" - games 3-10 years old - from EA, Ubisoft, Bethesda, Square Enix, etc. so I wouldn't be surprised if they showed up in a few years. Unless XSeed deem GOG revenue so insignificant they don't want to bother, but we've gotten various games from them.

Hopefully GOG will make it happen! Fingers crossed.

Was looking on the forums over at Steam and it looks like these ports don't have any Keyboard/Mouse support so you are required to use a controller. That is a bit concerning as to the amount of work is being put into these PC ports if they are not even adding Keyboard and Mouse.