http://www.techradar.com/news/htc-vive-pro-can-do-what-vive-cant-use-your-hands-as-controllers

The HTC Vive Pro was one of the more interesting reveals at the CES 2018 tech show, in part because of the two lenses on front of the visor that sparked much discussion. Initially, HTC wasn't saying much about them.

Could they mean that the new HTC Vive was going to support augmented reality? (That was my guess.) Could they be some kind of built-in tracking feature? The questions made the device seem more exciting than some of the features we heard about during the official announcement.