They addressed the SDK availability here - https://twitter.com/playdate/status/1400849495198289920?s=19
Basically, they don't have resources yet to open it up and support it enough for people to have good experience with it.
Basically, they don't have resources yet to open it up and support it enough for people to have good experience with it.
You need to let people start getting ready for this any way you can, especially as this is a potentially niche product that's not going to have any major developers working on it.
Best I can do right now is work on game logic elsewhere and try to be ready to do a port when they finally go public with it, hopefully before its official release.
Maybe they don't? They seem to have plenty of games coming out in time for launch from great developers.