Among the changes in Chrome 56 Beta are:
- Showing a "not secure" warning for HTTP password and credit card pages.
- Web Bluetooth support for Bluetooth Low Energy devices.
- CSS position "sticky" support.
- WebGL 2.0 is enabled by default on desktop platforms.
- Remote Playback API on Android to allow remote playback controls for smart TVs and speakers.
- TLS 1.3 support.
- A ton of other developer-oriented changes for making a more modern web.
More details via the Chromium.org blog.