I think these videos are both a delight and a good sense of how these types of things are actually going to function once we get our paws on them. It looks to me like any problems people had with the keyboard, other than being non physical to touch, were easily dismissed. I can't see any reason I won't like using the keyboard, and the intelligence of it alone seems to surpass what is already out there.
I think Apple is handling the launch of their most anticipated product very well. Not too much info at once, but enough each day to keep it interesting up until the big release!