Graphics driver for sc8280xp are already a thing. There are more issues in convenience daily driving linux, currently. From the top of my head:
firmware update path
dtb update/loading path
no virtualization
no universal dock compability
missing HDMI/DP features
I suspect that these issues are common between their ARM chips and will be addressed for both chips almost simultaneously. But I have no real idea on kernel development. And their documentation is only shared with linaro so one can only guess.