I am beta testing the new OSX for Mac: 10.10 Yosemite.
I did a few checks and found that the following software does NOT work:
1) EOS utility. Why am I not surprised? This happened with previous OS X upgrades as well
2) X Rite Colormunki Photo does not install. I reported this and X Rite promised that they are working on an upgrade
I know that a lot of us EOS Utility for tethered shooting, hence the warning