Looks like you will have to go back to 10.8.x until February.
http://www.graphteccorp.com/doc/Topics_Status(Win8&MacOSX10.9).pdf
As long as you have backed up up your OS 10.8 partition or keep it as a separate partition you should not have any problems.
10.8.5 is just fine on my working partition and allows me to get all my work done while I have installed a clean OS 10.9.1 on a test partition a few weeks ago and have been installing software to it when I have the time but for reasons like this I am in no hurry to get it to a working partition yet.