The forthcoming Julia 0.7 release will provide warning messages for important (and breaking) changes that the community has been clamoring for. I don't think users are "worried" so much as they are planning to review and update their code accordingly. For example, I don't expect my existing 0.5 code to work without substantial revisions. This is the last window to improve the language proper before the 1.0 release, after which users like me will expect stability.
Just FYI as noted above, 0.7 is the harbinger of 1.0. It is functionally equivalent to 1.0 except deprecation warning, serving essentially as a migration version. So while not out yet, 1.0 is around the corner!
