Apple is expected to release the new version of OS X – version 10.10 with code name Yosemite mid October.
We have tested most of the viewers, except Firestorm with the Golden Master candidate (very close to the final version) and no functional difficulties have been experienced, so compatibility seems to be exellent. Frame rates seems to be a bit clunky at times, but the version we have tested on is still full of debugging code, so performance should be much better when the final version of 10.10 is ready.