There are, as usual, some catches. I for one was disappointed to hear that this A2DP ability won't work with first-gen iPhones like mine -- you'll need to have a 3G to do something like this. And of course, this will require the iPhone OS 3.0, which isn't technically out yet (though devs in Apple's development program are playing with it right now, which is why you can see it in the video above). And finally, you'll need a car with the Bluetooth capability, which (though I haven't owned or shopped for a car for a few years, so maybe things have changed a bit) is still kind of hard to find.
But hey, even if you're not there yet, here's a look at the future. Where we're going, you won't need wires to get your iPod playing music on the car stereo.