Google building new camera API

Well it looks like there was a new camera API that was supposed to ship in the Nexus 5 but it ended up getting pulled a few weeks before launch. Supposedly it would feature burst mode, shooting in RAW, and "substantially improved image quality". This would explain the camera app being basically the only thing untouched by KitKat as well as the marketing behind the Nexus' camera.

http://arstechnica.com/gadgets/2013/11/google-is-working-on-a-new-android-camera-api-supports-camera-raw/