So, in concept I really think this is the future of filmmaking. I'm a professional DIT on films - we are even using Final Cut X on our current feature film we are doing. And I see a lot of potential for something like the iPad Pro as a quick on set editing device, in addition to all the other uses people have found for it. However, 128gb is just simply not enough for real 4k video. We shot 4k on the Alexa Mini and it essentially has 9 minutes of video for a 128gb card. Is Apple finally going to allow real external solutions? Or are they assuming you're shooting 4k hyper compressed 4k video? Which some consumer cameras do (not very well, GoPro is improving). That means it's not really for video Pros, even though they are calling it Pro. Sorry if this was rambling. Again, I love the concept, but I don't think they really allow for a good implementation of "editing 4k".