LG has officially confirmed that it is planning to release a Jelly Bean update for the Optimus 4X HD and Optimus L7. It also said that it will push Android 4.1.2 only to the devices that are unlocked. This is probably due to carriers wanting to approve the update for the phones they sell under contract.
The update will roll out nearer to the end of March, with users being able to use LG's mobile Support-Tool to update their device. For those who have the gift of understanding the German language can check out the source here.