The Nexus 5 isn't pure Android, it's pure Google
In this, the fifth year of Android's existence, we also have seen the release of the fifth Nexus phone — appropriately enough called the Nexus 5. Meanwhile, it's been two years since we saw the release of Android 4.0 Ice Cream Sandwich — and since then we've only seen "point" updates, up to and including the latest, Android 4.4 KitKat.