In a 7 minute movie (which I don't plan to see integrally), there is lot to see, perhaps you could be more precise / descriptive?

If you mean, like I saw in the first seconds, drawing progressively line images (and text), it has been done in the past, indeed.

The presentation makes you think that all images are painted by hand (and in real time), but if you look closely, i noticed that there are complex paintings and simple paintings. The simple paintings are done by hand, the complex paintings are SVG files.
This kind of presentation is really simple, because you only need a timeline (like Flash) and a way to display a SVG file like it's being hand drawed.