Google is rolling out a new build of Chrome today, and it's the stable version. Since it's been through both dev and beta channels already, we've got a pretty good idea what's new this time. Among the most important on the user-facing side, there's better support for colored status bars and enhanced websites notifications.
Based on what we've found in v48 before, we've got the aforementioned colored status bar attribute and actionable website notifications. There's also support for the Cast API on websites, and the Bluetooth web API. Those are both less common right now, but you might still run across a site or web app that supports them. You also have the usual collection of bug fixes and performance tweaks.