Yeah, that's quite similar, though I don't know if there's a whole tree behind the MS thing, that wasn't as clear - it seemed as that was limited to just zooming in into high res data for a long time until you reach the end of its resolution, and image only. The Sony technology seems to link in new data virtually endlessly, including movies.
What's interesting is that they mention it can do authoring, and in that context the demo they give is interesting - you see a calendar, and it almost seems that you can zoom in on different kind of product releases that they do on the calendar days (and then zoom in on the products in those announcements, and then get to see additional content - I liked the zooming in on a mosquito in someone's cheek in a picture and if you zoomed in close enough you seemed to get a pop-up for a commercial for mosquito-repellant or something)
So it really looks like a web browser, but instead of links you basically see a tiny version of the linked content that you can zoom in on.