Last night, 73v1n, the author of the last few CyanogenMod boot animations, posted an updated and completely revamped version designed for CyanogenMod 10. It's very likely going to become the official animation of the ROM in the future, but if you want some of this goodness on your device stat (especially if you're running CM 7 or 9, as the version number doesn't appear in the newest animation), you don't have to wait for CM10 at all - 73v1n has now uploaded it for everyone to enjoy.
Download: The Gorgeous CyanogenMod 10 Boot Animation was written by the awesome team at Android Police.