Has anybody discovered any hidden features like the recent 'Share' settings? I think so many features are there within Windows 10 waiting to be enabled.
What exactly don't you understand? Actually MSFT never named them Prelease of RS2, they all were called: "pre-release_rs".
RS 2 (Creators Update) won't release until March 2017 ver. 1703. So any Builds released before then would be pre-release. Understand Now ?
I know, but anyone can claim they're running a build that they don't have with simple registry modification.