I did a complete backup, then just installed the CM10 preview from Goo Manager/TWRP over the top of my current setup. No data wipe or uninstall, just clear cache/dalvik
Installed fine, all of my apps seemed to be there. No audio, but wifi seemed stable. All of my settings carried over nicely, wifi, go launcher, etc.
I tried 2 games. Plants vs Zombies and Osmos HD. Both seemed to work fine for testing, I didnt play long.
But, with no sound and other issues, I ended up restoring my backup after about 5 minutes also.
But it looks very promising, thanks to the Devs for the hard work!