Airplay
Airplay does not work on my mid-2010 macbook pro. I certainly hope that they choose to include those of us who had spent $2K+ on a laptop two years ago into this "elite" club...then again, their justification will be "buy the newest mac."
I was actually excited up until this point when I found out that this "Most Advanced" OS is nothing more than a few new useless features. I have not been disappointed by Apple up until this point and I certainly hope that they are able to find a way to rectify this issue and provide the one useful feature to be accessible by all (2008 and over, that is).
MacBook Pro, OS X Mountain Lion, Airplay