As part of our continuing work on overhauling navigation throughout Moodle, we've just finished up a first pass at a user menu dropdown system (https://tracker.moodle.org/browse/MDL-45893). This is a feature that a lot of community themers have integrated into their own themes, and I'm excited to be a part of building it into Moodle core.
Don't worry too much about the old login_info renderer going away; this will only replace the use of it in the header, base and bootstrapbase will still call it in the footer and if you're using a custom solution this shouldn't affect you at all (unless / until you decide to use the new renderer, albeit).
There've been some changes to the bootstrap navbar as well; it's now a renderable with all that entails. Menus can now be enqueued in the navbar, optionally specifying whether or not they collapse on narrower screens and a custom hamburger to use if necessary!