Haven't seen any sign of it for mine. I have the T-Mobile model (LG-H811), and LG's own support page for it says that the latest version is 6.0.
Well, I don't know for certain it is the 7.0 update. It just said "a newer version of Android is available" the last time I logged into the "My Sprint" app; gee, maybe they could provide a little more detail? I suppose it could just be the 6.0.1 point release; they dragged their feet on that one too, and at this point they might as well just go straight to 7.0.
Edit: Oh, this is cute. So I logged in to My Sprint again, and tapped "Update" instead of "Cancel" when it gave me the notification, figuring it might tell me what it was going to install (and give me another chance to back out before actually changing anything). After tapping "Update", it just gives me a screen that says "Your system is up to date" without doing anything.
So the notification was apparently a decoy.
Edit 2: Maybe this is an indication that they will be rolling it out soon, and the My Sprint app just got a little ahead of the game? I can dream...