I understand what he's saying, context is important, he's not saying you'll find out the spec's after buying, what he's saying is that it's too early in the production to give that away, because revealing your cards to your rival is not a good idea, but in terms of the movie analogy, it's like letting someone review the movie before the movie is done filming, or talking about a plot of a book before you're finished writing and publishing it.
I guarantee we'll get to know the spec's before we buy, it has been like this for every console release.