replacing the Gallery app with its Photos app. We were a bit skeptical that would happen too soon, because the Photos app is so closely tied to Google+, but it does still offer the offline options that you would want from the Gallery app. It seems that Google is pushing the Photos app forward a bit, because with the Android 4.4.1 update the camera app now pushes you into Photos when viewing your pics rather than the Gallery app. The Gallery app hasn't been removed yet though, but this change does affect all Nexus devices that got the update, not just the Nexus 5.There have been rumors around that Google might eventually look into
It also has been confirmed that the update does fix the audio problems on the Nexus 5, and the bug that cause the notification bar to become opaque at times. But it's unclear if the update has fixed anything specific on either the Nexus 4 or the Nexus 7 LTE. We're hoping that Google will release a change log for the update, but we haven't seen anything yet.
source: Android Central