Old Apple TV will NOT get new features
Will I upgrade? Probably not. The old ATV will be better for my needs, and all I'm missing is Netflix in my eyes.
Apple changed from Intel to ARM (A4 chip) with the new ATV, so porting everything over would require a lot of manpower (read: money). This is still a "hobby" for them, and at only $99 the upgrade isn't that bad for those that need it.
The biggest downfall is losing local storage if you upgrade.
24" iMac 2.16GHz, Mac OS X (10.6.4), Apple TV, 1G+2G Shuf, iPod Mini, iPhone 4