LG has announced on their Official Facebook page that they would start rolling the Android 4.0 Ice Cream Sandwich update starting Q2 2012. They already confirmed the Ice Cream Sandwich update for the LG Optimus 2x, Optimus Black, Optimus 3D and Optimus LTE devices last month.
The LG Optimus LTE, Prada phone by LG 3.0, LG Optimus 2X, LG Optimus Sol, LG my Touch Q and the LG Eclipse would be the first LG smartphones that would receive Android 4.0 in Q2 2012. The LG Optimus 3D, LG Optimus Black, LG Optimus Big,LG Optimus Q2 and the LG Optimus EX would get the Ice Cream Sandwich update in Q3 2012.
The exact date might vary based on the country and the carrier. They also said that the exact dates would be announced before the update starts rolling out.