For kickstarter backers there is a version already available on GOG. People are already playing it.

But there are also people like me around who cannot get their damn backer's keys and THEREFORE cannot get the GOG version (nor even the Steam version in my case).

Providing those keys is Larian's repsonsibility.
You know, the people who said
"As a Kickstarter backer, on release, you will have the option to download the game via Steam or GOG, just like we promised."
https://www.kickstarter.com/project.../comments?cursor=6958986#comment-6958985

No keys in my vault for me yet and release day has come and gone.