Windows 10 is still not appropriate for real-time rendering software like XPression. The most glaring issue being that Windows Defender will actually automatically turn real time scanning back on after being turned off for a period of time. This is a huge issue for software that operates in environments like XPression. Real-time rendering can't happen if the OS is auto-scanning files as they are accessed by the software.
There are other issues as well, like how Windows 10 dishes out updates. But even if we brute force issues like this to go away (by editing registry's or installing software to protect the changes we make) we still can't confidently provide Windows 10 to customers. We don't know what the next Microsoft update might do.
Until Microsoft settles down on Windows 10 features/updates and grants more control over the OS I don't think we'll see certain types of broadcasting systems qualify Windows 10.
If I was speculating, I don't think we will see XPression qualify Windows 10 for real-time rendering any earlier than January 2017 - a year and a half after Windows 10 release. It could stretch even as far as July 2017 - two years after release.
#XPression