Hi BigSkyBorn,
Welcome to Apple Discussions!
I suppose bluetooth
could be used, but I wouldn't recommend it. At least in my experience, it is not 100% reliable --- a hard-wired connection would be the preferred way to go.
With regard to mini DisplayPort audio capabilities, from what I've read no one has definitively tested whether this is possible (since no mini DP to HDMI cables are available), but I read a blog (Daniel Eran Dilger's) that clearly states that mini DP does
not carry audio. This is despite the fact that the VESA standard for DP does include audio.
I think it might be possible that third party manufacturers will produce, in addition to a mini DP to HDMI cable, one with an additional integrated line that will plug into the audio out of the MacBook; not a particularly elegant solution, but it might be okay.
It is disappointing that Apple did not make this easy. Could it be that they want to protect sales of AppleTV with its HDMI output?