Most of the time the master branch will be the next ‘dot’ release — so currently 1.2. When we get close to a release we make a new branch for it; iOS already has a release/1.2 branch, so master is 1.3.
Encryption on all platforms will be part of the 1.2 release; we don’t have a public release date yet, but it’ll probably be “around the end of the year”.