I would still like to fit in another theatrical viewing and then I'm going to wait for the Bluray release, which is likely the better value. I would be interested in seeing some screen caps of the HD transfer that's up on iTunes, though.
On a related note, I recently had an entire season of Mad Men vanish from my iTunes library; Apple doesn't own the license to most content, so it's liable to be pulled by the provider at any given moment. I didn't have the episodes stored on my computer, but you can always re-download purchased items from the cloud -- unless you can't! I somehow doubt it would happen with IV, but it's made me think twice before buying content via iTunes. I used to be a big fan of that method and have several TV shows attached to my account, but this recent mixup is a reminder of the virtues of physical media. In Apple's defence, I contacted their support team and they did supply me with some credits to re-download the episodes. Also, renting and streaming via Apple TV is still super convenient.