Haven't had a chance to run this one yet!
I've upgraded, as well. Same issues as before: the NVIDIA driver (for my GTX 660Ti) required (clean) re-installation due to the missing / butchered openCL.dll, my Registry Editor still crashes when searching for a value that does not exist, and my Mail App is not synchronizing / working as it should. Regarding the Mail App I will uninstall / re-install it.
On another context I got an update for Office 2016 desktop version today.
This update was smooth and no BSOD, there's no driver conflicts, well done MS
Can't disable the Lockscreen in this build. I have the home edition. Already tried editing the registry. It doesn't work anymore. I think this is ridiculous.