Here is the latest leak for the AT&T LG Nitro HD, I have no info on it. So have fun, I am not responsible for your actions!
http://www.gigashare.in/427a5 (don't mirror, link to this post for download)
As usual, a big shout out to our anonomous source!
[FIRMWARE] P930_UDT_v18f_04112012 (Nitro HD ICS LEAK)