Now, thanks to the sighting of a FCC listing, more details about the LG D821 have been leaked. The Phandroid notes some features revealed by the FCC suggest the LG D821 runs AOSP (Android Open Source Project), and has support for AT&T, Sprint Wireless and T-Mobile networks. The listing notes that the device includes wireless charging support and features a 4.96-inch display. The listing also reveals that the LG D821 is a GSM model with LTE support. The dimensions of the device are said to be very similar to LG's flagship, the G2, notes the site.
With this information, it is currently being speculated that the LG D820, which first appeared on the FCC last week, is indeed the Nexus 4's successor, sporting visibly similar dimensions as the Nexus smartphone that was spotted in the official Android Kit Kat video released by Google a few days back.