My guess is that Apple is trying to build channel momentum any way they can. Unable to pre-negotiate deals and launch with a huge splash, as they prefer, they're doing it from the bottom up, starting with content providers like Crackle that probably get a lot more out of it than Apple does.
But as we've seen, Crackle begets Smithsonian and Smithsonian begets PBS and PBS begets ABC. So it seems like it's working.
I bet in the next year, we'll see some sort of foldering option for home screen icons.