I am quite sure many of you are unhappy about the new Apple TV features which will not be available in old Apple TV. Even Ars Technica has confirmed about this whole episode. Moreover, Apple spokesperson has said that the maximum HD resolution of the Apple TV is 720p, consistent with recent rumors. It was also added that there will be no software update to bring the new features to older Apple TVs. Older Apple TVs will continue to work as they have been working up to that point, and they will continue to be able to purchase movies and TV shows even though the new Apple TV is rental-only.
It got every reason to stand as that the old Apple TV runs a variation of OS X (Tiger) on Intel and the new one runs a variation of iOS 4 on Apple A4 and Apple probably don't want to devote any resources to making a distinct update to a now dead system.
Now for those who preferred to be able to sync and buy their media on-device won’t be shedding any tears or trying to avoid any updates that take those features away.