As usual, all of the app icons in the photo itself have their own meaning. I mean, I don't mean to over-analyze things. But clearly, the calendar icon being touched says "Wednesday 7", which is the date of the event. There is a Maps icon because it is an invitation to a physical location. There is also a Keynote icon for obvious reasons.
The media event takes place at Yerba Buena Center for the Arts in San Francisco at 10 am, the usual time for Apple events. I hope someone will stream the event live.
