IMO it's a bit early, but HP seems to be almost saying that it will be compatible but uses odd wording that makes it sound as though HP's currently shipping computers will actually make Windows 11 even better:
"HP’s currently shipping Windows-PC based portfolio will enhance features from Windows 11, outlined earlier today by Microsoft. This includes:
Currently shipping HP Spectre, HP ENVY, and HP Pavilion portfolios, including the HP Spectre x360 14, HP ENVY x360 15, and the HP Pavilion All-in-One."
Source: https://press.hp.com/us/en/press-releases/2021/hp-is-windows-11-ready.html