It wasn't exactly crystal clear during Steve's keynote today, but apparently, there's a fair bit of red tape attached to these movie rentals. First off, since the Apple TV hardware is remaining the same, users can still only expect 1,280 by 720 resolution on the high-end, and although 100 HD movies are reportedly ready to be viewed, not a single TV show can say the same. Furthermore, a note at the bottom of the Apple TV's revised tech specs points out that "Dolby Digital 5.1 surround sound is not available with all HD rentals," so there's that. We've also learned that HD movie rentals will be available exclusively through the Apple TV, and considering that only rentals made from iTunes can be moved to other devices, any downloads originating from the Apple TV (including everything in high-definition) won't be making their way onto your iPod, iTunes library, etc. Depressing, we know.