Apps in Android O will have wide color gamut support which means that developers will be able to select which color gamut profiles they want their apps to be displayed in based on different display types. This won't apply to just any device that is running on Android O as there will also be physical device limitations, meaning that a display would need to have the necessary hardware components that would allow it to also support wide color gamut profiles for applications.
Now that Google is adding a native way to display apps in various wide color gamut profiles on Android, the operating system in general should be a better tool for those in a profession where knowing the accurate color reproduction of a display is an important detail. This likely isn't going to affect the average user in a meaningful way but there are sure to be some people who find this kind of stuff fascinating and will enjoy being able to have these details at their fingertips. For the most part though this will be a nice feature to have on hand for developers, as well as anyone who works with professional imaging, video editing, and other similar fields.
As this is the first developer preview of Android O, it shouldn't be surprising that most of the features which are accessible at this point are more developer-facing as Google did intend for this version of the software to be for developers only, even though they are letting anyone download the system images if they choose to. So far there are a range of different features that have been discovered in the first Developer Preview, such as the adaptive icons which will allow device OEMs to apply an icon mask to help unify the look of icons across most of the system, and features that will be more noticeable to the everyday users, like the support for high-quality Bluetooth audio codecs, and the picture-in-picture modes that will allow users to watch a video from somewhere like YouTube while they browse or do something else in another application. Google plans to launch four developer preview builds before they finally release the stable version of the software to the public, which is expected to be sometime in Q3.