Battery Saver to be much more customizable:
It will allow setting the threshold for activating “Battery Saver”. There are other changes in Settings UI.
Much wider USB support including support for USB Type-C and Dual-Role scenarios. Support for USB keyboard, Mice, USB Mass storage and more is present now. USB Type-C brings faster charging, Audio / video Output support and charging directionality.
Devices to be updated within 4-6 weeks of update release with Project Milkyway.
It confirms beyond doubt that Windows RT has been killed.