Flat maps have a hard time communicating elevation changes, but now you can access the data to visualize as you want. Google Maps added two elevation services, bringing you the meters above sea level for any point on earth.
Google further expanded its potential to become a virtual reality platform with expanded WebVR support to Cardboard. Prior to the announcement, Google limited WebVR support to Daydream-ready phones. Through the use of WebVR, Google encourages developers with cross-platform opportunities.
Yesterday, Microsoft presented a vision for dual screens. Windows 10X is Microsoft's version of Windows for a dual screen world. While the presentation was full of announcements related to dual screens, the Windows 10X emulator should be a particular interest to developers.