No, Firefox is at v15. v16 will be released on Oct 9th. Personally, I just run the Nightly (http://nightly.mozilla.org/) and get an update every day. It's simply "today's build."

The version number is meaningless. What is meaningful, however, is getting millions of people to help test beta browsers. If Chrome is your browser of choice then help test the Canary builds (https://tools.google.com/dlpage/chromesxs)