Some calendar events are shown. I just tested this, and timed events are shown in the feeds for a period before and during the event with a nice little calendar icon. And if you slide the notification to the left or right in the wallpaper screen, or touch it in feeds, you are brought into the calendar at that event. I am not sure what the time limits are (i.e. from how long before), and all day events (such as birthdays) do not seem to be displayed. Oddly enough, this feature isn't mentioned in the official user manual.

I agree it would be nice to have some control over this functionality and perhaps extend it a bit.