Talking about the Calendar app update first, the app now brings location autocomplete for events. So, if you are entering the location for an entry in Google Calendar app, it will give you autocomplete suggestions. The update also brings Hangouts integration and that is about it.
Coming to YouTube update, the latest version of YouTube app allows casting of live videos as well as brings user interface changes for Watch Later section.
Both app updates are rolling out in phases and might take some time to reach your Android device.
