It doesnt matter much anyways... it's not going to be a major release, its mainly just going to deal with hardware issues that the current macos9 would have on apple's new computers (that havent come out yet).
I'm waiting for 9.1 which among other things, will finally get rid of the 31 character limit on file names. That's something that has needed to be dealt with for a long time. I can't remember what else is going to change in it, I read about it like 2 months ago on mosr.. but it should be cool.