The Other Half (TOH) is a swappable back cover that does more than protect your phone — it transforms it. The original Jolla Phone (2013) pioneered this with open I2C interface and NFC-enabled covers that changed themes and behaviour just by snapping on
(…)
With the new Jolla Phone, we’re taking TOH even further — and we’ll open source the hardware and software interface specs so anyone can design, 3D-print, or produce their own modules. Primarily we plan that the new The Other Half interface would be based on I³C.



Yeah, that kind of bummed me out as well. It’s all about sustainability and then the OS is closed source, meaning you can’t have custom versions of it after support ends…
On the positive side it’ll possibly be a great phone for postmarketOS.
Why would you think a company that offers a closed source OS would give out their drivers?
It runs om mainline Linux, generally better to get drivers supported upstream? Also it’s not a zero sum game, they benefit from mobile Linux doing well as an ecosystem. Just because it’s not open source doesn’t mean it’s irrational and evil. Not yet, anyway.