I do not have a 3D tv, i don't plan on doing so cause i get severe headaches when watching 3D style films. So you might just need to do another post asking about that.
check this website, maybe it will help:http://hdguru.com/3d-hdtv-and-hdmi-explained/1336/
To answer your other question, I am 99% sure audio is present on both mini and reg HDMI. Again, i don't have much experience with mini HDMI. My gtx 660 ti has full HDMI port so never really messed with it. But a buddy has a camcorder with mini HDMI out and he streams his audio/video through that to his TV.
Sorry cant be more help