The top has a lot more definition. It's clear on the typography in the Wednesday, the spacing in relation to the icon and the edges of the icon itself.
Not only that, but there seems to be NO home button, which explains the mention of the "And touch." in their invitation. How can we know? First, the photo they are showing is on portrait mode. You can't achieve that icon spacing in the landscape mode (which is the only explanation for the lack of home button).
The event will be held at the Yerba Buena Center for the Arts in San Francisco and is scheduled to begin at 10:00 AM Pacific / 1:00 PM Eastern. The tagline on the invitation reads “We have something you really have to see. And touch.”