I have the feeling that any new features of the new firmware will be revealed when releasing the stable version together with a new MiFit version. As long as the versions above 1.0.6.16 are in beta (or non-public) stage and we're not supposed to have them, we are not in position to ask any questions and they are not obligated to answer. Until then, we can find out some parts of the changelog by installing and testing...
By the way, no language has been deleted; just some languages were activated temporarily and then deactivated.