Sony has officially released a new firmware update for PS3, version 3.42, which seems to only include "additional security features" as explained by Sony's director of hardware marketing John Koller in the official announcement on the PlayStation Blog.
As rumored and then confirmed by Eurogamer, this firmware update's intention was to stop the much-discussed "PSJailbreak" exploit -- in which users used a USB dongle to "fool" a system into thinking it is a debug unit, allowing installation of "unsigned code " (the expectation being pirate games) on the system.

