Android L is undoubtedly going to be one of the biggest Android updates in years. To ensure it's a smooth rollout, Google has already begun slowly transitioning its many Android apps and services to follow the new Material Design interface principles. The Google Play Store already received a half-makeover, and now Google is testing out the new design on its Chrome Beta app.
While it's not the official standard release Chrome, it's likely that Google's getting some practice in before the real thing arrives, just to work out some of the kinks. Chrome Beta now features a simpler, streamlined design; the menu bar is flatter, and the overall interface just feels more futuristic than Chrome does currently.
Chrome for Beta also features a dark theme for Incognito Mode—as if to imply that incognito browsing is a "secret" thing—as well as a new icon and a more simplified sign-in process. And, as has been the case with past versions, Chrome Beta also features a few bug fixes and performance improvements.