Heads up that the X16 1000 units has a good chance of happening before the end of this year. It might slip to early next year - but the already-released 100 units has been successful, no show stoppers on the hardware side of things have been reported, and the 1000 units has been funded. So it's definitely a go, just the timing is at least still a couple months out.
Prog8 is proving to be a decent development environment for the system.
More info is here:
https://prog8.readthedocs.io/en/latest/ASMEDIT is an on-system assembler and editor, verified to also be working on the hardware. It uses an older/original "CBM" format of assembler than the more modern .s format. You can certainly develop "from the outside" and transfer code in, but there's been a general goal/desire of being able to develop standalone on the system itself.
More on-system support tools (e.g. X16EDIT, hexEdit, BASIC tokenizer from text files) and tutorials are also available.
Of course the cc65 C compiler works fine for the X16 as well.
Some 3D work has been done, but we're all still curious to see what this system could really do with the 8MHz speed and banked memory (and the new audio/video hardware). Planning on showing a couple new things on the hardware next month at VCF!
While it has an IEC like the C64, one slight negative is the X16 UserPort isn't quite the same as C64. So I've been looking into getting some kind of RS232 or WiModem support going, I think we'll need some new terminal software - could use help on that too.
Anyway, if you haven't caught up with the X16 recently, just a reminder about it !!
It is based on a 65C02 and it has a licensed ROM build of Commodore BASIC, so it starts right up to that - that gives it some familiarity, but it is not a Commodore clone. There is a bit of a learning curve to the VERA and YM hardware, but it's doing great stuff!