I guess the question is how they highlight things so I can easily switch back to the app that's playing the music, so I can pause it when necessary, how much space they make available to individual apps (I have about 5GB of music on my phone at the moment for Spotify), and what the model is for apps sharing data (so I can download a photo in one app, change it in a second one, and upload it with a third one).

I'm looking forward to seeing what their equivalent of "intents" is.