Very early OSX builds for Maya 2015 and Maya 2016 are ready. Only (briefly) tested on El Capitan, so let me know if there are any problems.
You can also try installing using “install.py” script now. Open console, change folder to where you extracted downloaded archive, and run “python install.py”. If it finishes without errors, just restart Maya and you should be good to go.
I’ll see if I can further simplify the installation, like a self-executable installer we have for Windows.