You can pause podcasts and restart them from the car, even days later. (as long as you don't restart the phone).
I would love to see airplay integrated also, but only because I am a geek.
Frankly, the internet radio and podcasts available directly from the car are the killer feature for me. I listen to podcats 50% of the time, and live streaming 50% of the time in the car.
Streaming is simple as one tap on my favorite station.
Podcasts, requires me to start it on the phone, but then totally controlled from the car. It is not best, but definitively good enough.
I haven't used other cars with airplay integration, I am curious, but somehow, I am sure it is not as rosy at it sounds (like only some app work, crappy response, scrolling etc...). So, I know what i have, and I am happy