So far, that's true.
The official release isn't for another two months.
So far, Windows 10 pre-releases have been the "Technical Preview" downloads, which are completely voluntary and under your control if you choose to play with them.
However, once the official release happens, we (users) lose control of our Windows computers. I am quite serious about this, and plan to post another thread about it within a few days after gathering a bit more solid info.
Something Microsoft is saying, but not too loudly yet:
When you upgrade to Windows 10 as a user, your computer WILL download the features and security updates automatically, and they WILL be installed automatically, and you Will NOT have any choice about it.If you run Windows 10, your computer is less your own than ever before.Moreover, Windows enterprise business customers will NOT have this happen. Microsoft is using YOU as their guinea pigs to test the updates for stability and safety first.
Windows is becoming a "service".
Windows 10 Service Branches (http://www.windows10update.com/windows-10-service-branches/)That's a pretty good summary of what is presently known.