Everything you need to know is on our release page, which we will update as we go along:
Stay tuned and join us on our journey on Discord or here on the forum.
Oh, and by the way: All licenses you buy in the sale will be valid for Kirby 4!
Damn, I promised myself that as soon as 4 was announced I was really going to start learning Kirby properly and really going through the documentation properly. I guess I better start putting some time in the diary…