With the release of Android Nougat, there was a lot of focus around the graphics environment. There was a lot of effort to support a vastly different graphics library called Vulkan, which promises console-quality graphics on mobile devices by taking advantage of modern hardware.
Graphic drivers are getting another set of improvements with Android O. During the Android Fireside Chat, a Q&A event held at Google I/O last week, it was mentioned that graphic drivers will be updatable through the Play Store. This means that as new updates to Vulkan or other standards are developed, users will be able to access these features without requiring a full system-level update. This is one attempt Google is doing to make the current fragmentation less of a problem.
This feature should be benefited by Project Treble, which should abstract hardware specific code and make it easier for updates to occur at higher levels without requiring the chip manufacturer to verify the update. Thus, these drivers can be updated at a higher level of the system.
It may seem like a small change for users, but it should make Android a more modular and modern operating system.