I downloaded OSX Mavericks soon as I got home, and intend on installing it in the next few days. However before I did anything with the install file, I wished to make a bootable USB key.
The process was easy and I followed the one from the follow Macworld post here.
Will post back some experiences with the new OS and already noticed some folks talking about being unable to play the native GoPro MP4 files. So will keep an eye out on the post here that talks about it in the coming days. Since I own a GoPro Hero 3 Silver.