I was thinking @CiberSheep that, since inevitably it will only display a subset of the entire app group, perhaps it only needs to be a partial screen? If we take the cue from Unity7, it has a list of apps: the icon on the left, and the app name on the right. And the "View All Applications" option there too.
As you've probably realized, I took my inspiration from the screen which precedes the one we're working on:
Subsequently, I had the idea to conflate the two screens, but it's a tad heretical! I think the "Properties" button ought to go on the screen that appears when you tap and hold:
The controversial idea would be to lose the "Preview" function altogether: since the OS comes with fully fledged music and photo apps, I think "Preview" is redundant. :o