The Developer Preview builds introduced an awesome multiwindow feature that was especially useful on the Pixel-C. The feature is actually disabled by default, but with a bit of digging and work you end up with a freeform window mode which brings the ultimate in multitasking. Unfortunately it turns out that this feature will not make its way to the final version of N. Ian Lake an Android Developer Advocate explained that the APIs are public and easily accessible. This means that other OEMs can add this feature to their devices, but the Pixel C nor any other Nexus device will include the feature.
