Patience everyone... Apple can only do so much at once, and as seen in the past, AppleTV is the low end of the totem pole for Apple and their revenue stream. At one point I seem to remember it being referred to as a "hobby". With that said, I wouldn't be surprised if the iCloud eventually does video too, but for the time being, Apple needed to dedicate their legal team's resources on securing licenses for music content, and also... Wow, if they did video, they would need a lot more then that giant data center in North Carolina..
Never the less, I am VERY disappointed they didn't mention AppleTV support for iTunes match. I am REALLY hoping once you match all your tunes you'll be able to play them on AppleTV. That will truly allow me to at least play music during a party without having to have my macbook pro on. 😉
For video, I have my NAS, jailbreak, and XBMC to prevent me from having to use a computer to stream the movies. 😉