Software & Android M
The Samsung Galaxy Note 4 is currently running Android 5.0 Lollipop but should soon get upgraded to Android 5.1.1 Lollipop, a new version that comes with bug fixes.
The Galaxy Note 5 is rumored to have Android 5.1.1 on board though we're still not sure what differences there might be, if there are any. We'd expect there to be given Samsung's history of improving TouchWiz with each new release. For instance, it trimmed down a lot of bloat for the Galaxy S6.
Google's new Android M should come to both of these devices. If the Galaxy Note 5 doesn't run it out of the box, it will likely get it before the Galaxy Note 4.
It's also worth mentioning that the Galaxy Note 5 will probably feature longer software support. Samsung typically offers 24 months of software support before kicking a device to the curb. The Galaxy Note 4 will have used up an entire 12 months by the time the Galaxy Note 5 comes out.
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