Windows 10 was released today. To answer questions about compatibility, Adobe has create an FAQ.
The Photoshop and Lightroom teams have been testing our applications since Windows 10 became available to developers. In our testing, we have found no significant issues with running Creative Cloud products or Lightroom 6 with Windows 10.
Earlier versions of Photoshop (CS6) were also tested to a lesser extent and no significant issues were discovered.
I personally recommend that customers do their own testing on a non-production partition to ensure that new OSes work with their current hardware and drivers.
If you do encounter issues not already documented, feel free to report them on our feedback site.