Linux?
Not yet. (https://discourse.ubuntu.com/t/ubuntu-24-10-concept-snapdragon-x-elite/48800)
Answered my own question.
A 12-13" tablet with this SD X SoC would be a very tempting alternative to iPad Pro and you would get mouse support, usb ports and a real OS.
Surface Go or similar 10-11 inch tablet or mini laptop form factor!
If only these Snapdragon X APU's had decent iGPU's.
However without a decent iGPU they might still make awesome Linux machines.