about 22 secs in, they show the iPad being used to type something.

from what i can tell the iPad is being held by one thumb.

I cant see how you could type on a device resting on your legs at a 45degree angle, and hold it with just the end of your thumb. its not a recipe for a stable surface

Agreed, but I don't think you can draw any definite conclusions. I think the iPad has a blue screen behind it and they dropped in photos of people's legs, etc. The angle/ways people are holding the iPad is too perfect, the legs are perfectly still and the rotation at 0:17 is way too smooth to be done by hand- they must've had it mounted.

I'm not saying Apple's bad for blue screening, it would've been difficult to setup those shots in real life, but like the "big hand" and shortened sequences for the iPhone, it's basically bordering on false advertising from my point of view.