From PM Jeff Tranberry:
We’re happy to announce that Photoshop CS6, Lightroom 4 and Elements 11 are compatible with Microsoft Windows 8.
The only issue customers might see is with document window transparency/flickering in Photoshop CS6 caused by video drivers. The drivers that ship with Windows 8 may not be the most recent available from the card vendors. See here to resolve this issue.
See the rest of Jeff’s post for a few additional details & links.