@Ben-J-Hutchison I feel like it was done like that to add the elegance of the video - you know what Apple are like with their trailers lol. Also, there were quite a few extended shots of people with their hand resting on the glass and drawing fine, and also the video of one hand using a digital ruler and the other hand using the pencil.
I'm sure the sensitivity numbers will be revealed before launch, and with the development, they were working with illustrators, so I'm certain it'll be up there with Wacom's pressure sensitivity. Although, that's just speculation at this point.
Ace