Starting in January 2017, Google Chrome will begin marking any HTTP pages with password or credit card fields as insecure. According to a post from The SEM Post Chrome will probably only mark the pages, not the whole sites.
It's just an indicator to let visitors know that their passwords or credit card info may not be secure - but it could impact their decision to use and browse affected sites.
This is just another in a long string of pro-HTTPS actions by Google. You should be pretty used to them by now. Eventually they want to mark ANY non-HTTPS page as non-secure. So if you're dragging your feet, get moving - Google's already taking the first step.