I think that video is great, I've seen the plans of the new circuit layout on the Donington website but the video gives a really good idea of what the circuit will be like.
Personally I think the track changes look really good and should make the track even better!
I wish Donington all the best for getting it finished on time (which I have no doubt that they will) because I'm sick of hearing people saying "Oooh it won't be done in time" etc. I just can't wait for it to be finished and show them all it was possible.