First of all, almost all the default apps have been updated to newer versions, just as the the email (4.1 to 6.0), authenticator and clock applications.
The guys who are examining the source code noticed that the stock app references have been reworded to indicate their separate publication on the Play Store, just like the browser and keyboard are now. Hence, if you have a low-end Android that runs only the core well, you can pick and choose lighter satellite apps. Moreover the idea of “Google Home” and “Theme” is being voiced, which might indicate some sort of launcher management system set in motion will come with Android 4.4 KitKat.
As for the device itself, the image stabilization has been added to the list of the leaked specs. This is for both, the front and the rear, cameras. No wonder the device is heavily based on the LG G2 which does have an OIS system inside.