Those of you saying us KSP Store people will have it good simply because we won't get buggy versions are all probably Steam users. I will not go too far into this but I am indeed disappointed that I will not be able to have access to what Steam users will.
This also complicates the Hype Train a bit. When will the train reach the station? When the Steam testing versions come out, or when the final version for everyone comes out? If the former happens, then I predict that the community will be pretty split up.