on the viiv debate, a few people have mentioned it already, viiv is not out of the question, just because the CURRENT specs on it do not support Macs does not mean it will NEVER support it. I doubt that is the announcement though.
As for a PDA or Phone or any portable device running some kind of OS X... no one seems to be mentioning battery life! First off, as far as I know Apple has never been a fan of all in one devices (phone mp3 player camera) but even if a PDA or tablet or smart phone is released some aspect of it will have to suffer.
A smart phone will have how much standby and talk time if you use it as an ipod or to play videos as well? I think apple was careful not to brand the 5G ipod the VIDEO ipod because they know of the battery life.
I have ripped a lot of movies onto my ipod, and I can watch a movie all the way through, but that's it, I impress tons of peopel showing them the amazing quality and such, they get all excited to buy one, then I explain how I had to rip the DVD and how long it takes, and how you have to be MODERATLY tech savvy to do so... furthermore that 14-20hour battery life is NOT rated for video. And that's not to discourage them, it didn't discourage me, I love my ipod.
SO, I think if there is any update or improvement or new product, batteries will have to catch up first.