Samsung has released full source code for the AT&T Galaxy Note Ice Cream Sandwich update, and as soon as they did, the CyanogenMod team start pushing out nightlies for the phone. That’s incredibly fast, and lucky for AT&T Note users.
Remember: nightlies are not stable releases, and may have many problems. Also, either the developers nor DroidDog are responsible for any possible damage that may occur to your device or brain. Mod at your own risk.