Onewheel GT was announced at the same time as the Pint X on October 27th 2021, however it did not start shipping until March of 2022.
Onewheel Pint X was announced October 27th 2021.
Onewheel Pint was announced March 13th 2019 at a small event in New York
Onewheel+ XR was announced at CES 2018.
Onewheel Plus was announced at CES 2017.
The original board which started off as a kickstarter on January 7th 2014. The initial kickstarter boards started shipping April 4th 2015. This board would later be discontinued in favour of the Onewheel Plus
The numbers at the top of each table is the board hardware, often abbreviated to hw. This is the physical chip inside the board.
The numbers down the side of each table is the board firmware, often abbreviated as fw. This is the software that runs on the board itself.
🤷♂️. FM decides what boards can run what firmware.
These are the different states of availability.
No. But you can read more about that here.