Seeing that the release date has been pushed to late 2021, I'd love to see something about an Early Access release on Steam or something. Or a Demo to quench my thirst.
Maybe taking the KSP1 route is a good idea, because that means you have countless people constantly testing your game, finding bugs, and giving feedback in general. I feel like a lot of people on this forum would be up for testing KSP2 even if it was in a half broken state. They could keep it a closed alpha as well where you have to sign NDA against surprises for the community and stuff. I for one would love an opportunity like this.
But, that's just a thought.
Keep it up Devs, I love you guys.