I'm getting really excited about Windows in general. Its the competition between Apple and Microsoft that is most exciting. But, I'm waiting a while before I put this into my audio PC's.

Kudo's for Windows.
Its reported working well on Samplitude.

I read it won't allow you to turn off auto updates. Maybe they want everyone to be updating any bugs.

Hello everyone,

Windows 10 will be released tomorrow and we expect that many of you intend to upgrade - especially because the upgrade will free from Windows 7 and Windows 8.

With the new operating system, Microsoft introduced many changes in regards to audio optimisations and lower latencies.
Also a new MIDI API is part of Windows 10.

Windows 10
 

For folks who still don’t like Windows 8 and want Windows 7 back, I have good news and bad news.