Chrome 56 is being rolled out to Windows, Linux, and Mac users and should be available to everyone over the next few days. HTML5 by default means that Chrome should be disabling Flash on web sites that I have not visited before. The Web Bluetooth API allows Chrome apps to connect to devices such as light bulbs, toys, heart-rate monitors, and LED using Javascript. This update also includes 56 security updates, with 4 of them being XSS vulnerabilities. The full list of security updates are described below.
Source: https://www.bleepingcomputer.com/news/google/google-chrome-56-rolls-out-with-html5-by-default-sticky-elements-and-the-web-bluetooth-api/