Overview page: https://www.gog.com/en/anniversary
Direct sign up for Galaxy Linux beta: https://www.smartsurvey.co.uk/t/YEF5EV/
I'm pretty sure there are forks. IIRC there were several forks when the AI stuff was announced. Yes, it's still a Linux kernel, but there is more than one Linux kernel. There is a mainline one, but there are other options too. There are also other kernels entirely too.