Although new Cortana support for Europe is the main thrust, there is at least one new feature: a quick toggle switch for Cellular Data.
Many users have requested Microsoft add the toggle to the drop down menu as an option for those who want to disable their cell data with ease. Now, consumers have the option to add the quick switch to their Notification and Action Center if they want the feature.
Build 14219 is still very new, so we are pouring through the update to find anything else that has been added. Hit us up in comments and let us know if you find anything else.
Thanks, @notcassim and others for the tips!