Wow - this is very interesting!
On the one hand, I'd want to say it's an emulator that combines the look of the XL with the new SD satellite local forecast backgrounds, but it almost seems "too perfect." The weather information is accurate and everything appears as it should.
Are there any other screenshots or videos available? I guess, in the absence of someone coming forward to say that it's an emulator that he/she made, we'll just have to wait and see what our XL viewers in the forum say about what they observe happening to their local Stars.
And, of course, this raises the question... if this IS real, will the Intellistar soon be updated to match this background, too, thus providing a constant and similar look across three platforms?