Ok. This is looking very cool. I am very excited for Xbox One Upload Studio.
While you may not get the last 15 minutes of gameplay, firing off a quick command to Kinect with Xbox. Record that, gets you the last 30 seconds, which you can trim, add additional footage too, picture in picture footage from Kinect and then upload the footage to Skydrive which you can then put anywhere else you want on the internet.
The Xbox One may be a reviewers dream come true for walkthroughs or video reviews.
3 Days to go!