10.2 has been going as a nightly for a little bit, I'm guessing the snapshot is a stable version, pre-RC. I still can't figure out how to get my SD to mount so try at your own risk... although everything else is very smooth and stable from what I've seen
Hey man, I've had the mounting issue in the past as well. Clearing cache and dalvik in recovery seems to get it working. The only time I lose it is when I get a random lockup/reboot, which happens maybe once a week. I have no issues if I manually reboot.
I hope this works for you.