Last I heard they said “late 2021”, and I interpret that to mean “December 30th”. Considering the time they’ve taken, and the publicity they’ve paid to create around this preörder campaign, there wouldn’t be much excuse for overrunning, but there’s also no incentive to do it early. In fact, some people would complain if they did ship in time for xmas now.
No – they originally implied tools would be available some time ago (before the console shipped), and lately they’ve started teasing some kind of high-level web IDE, but they still aren’t committing to a date for either. Favored developers have been making games for it for a while, so a toolchain exists, but I would guess it still requires hand-holding from Panic and so can’t be released generally.
If it weren’t made by reputable people, I’d be harboring serious doubts about the whole project, as it’s usually a red flag when something that’s already delayed keeps announcing ambitious new features. I’m choosing to be optimistic though.