Add me to the list of the disgruntled. I have a projector with HDMI input, but it has no speakers at all. I've been using a PS3 to play movies and stupidly bought an Apple TV 3 as soon as they came out, incorrectly assuming I could hit my Airport Express-connected stereo speakers for sound (there really are no other good options for those of us with projectors that I can find). Excitement crushed when I realized my mistake, so it's been just sitting on top of my ceiling-mounted projector, hooked up the the alternate HDMI input, useless for anything except viewing photos. Imagine my renewed excitement when I heard about the Apple TV IOS 6 beta and the new Airplay feature. "Finally!", I thought. Uh, well, no. Turns out it only works for music. Crushed again.
I'm a multi-decade Apple fanboy. I admit it. I have loved how "everything just works" in the past, and I've spent tens of thousands on Macs, iPhones, iPads, iPods, and now an Apple TV. This is unbelievably lame. Why would anyone want to stream Airplay music from Apple TV when their computer or device can already do it? I agree with craigriches, movies are the only real reason for it.
I can only assume that this must be the real reason they fired Scott Forstall.
Shoddy work, Apple! Fix it already!