Ok, I've watched the link from lisalulu and here is my theory:
It's simply a camera trick, a version of the 'freeze the left side of the screen while an assistant makes the change'. If you look at the start of the programme the balls are all lined up perfectly and all sit on the bottom of the stand but when he turns the stand around at the end the #39 ball is raised up slightly, perhaps where the assistant made an error.
There is loads of camera shake to try and hide this; you'd expect the picture to be very still to allow you to freeze one side of the screen only, but this is the misdirection.
At the start, the camera shake is very fluid (with a bit of fast zooming), but there is a point where he walks in front of the balls and over to the right, and this I think is a bit of misdirection too, to hide a transition between real camera shake and a clever bit of CGI camera shake. To me the wobble after this looks a bit artificial.
It'd be fairly easy to introduce 'fake-shake' to a live stream with all those reference points a computer could use, specially with the brick wall behind basically providing a grid to work from.
I think the whole CGI'ness of the trailers for it, and him juggling CGI balls could be a hint?
That's my thoughts on it anyway, come Friday I'm going to look either smug, or a complete tit