evolution of the Nexus phones, but this GIF helps to more easily visualize the changes we've seen in the hardware from the Nexus One until the Nexus 5. It also helps to visualize the changes that the Android system has gone through from Android 2.1 Eclair until Android 4.4 KitKat.We've covered the
As you can easily see, the real transformation happened with the Samsung Galaxy Nexus and the update to Android 4.0 Ice Cream Sandwich. The device saw a big jump in display size (which was somewhat off-set by the introduction of on-screen function buttons), and a complete overhaul of the system UI.
Given that Google has tended to save major UI overhauls for full .0 releases, we can't wait to see what's in store for Android 5.0.