It'll also very likely come in handy for apps on Microsoft's dual screen Surface Duo device that is due out in a few months. 

Also added in the new build are network APIs, foreground services updates for the camera and mic variable refresh rate support and lots of other technical background process things that normal people rightly never have to think about.  

Developer previews are technically available to anyone with a Pixel 2 or later, but as the name suggests most people should steer clear. Developer previews are usually full of bugs but are pushed out to devs in order to let them build apps for the next Android version and to report back to Google with bugs prior to the public release. Android 11 is likely to launch around October with the presumed Pixel 5