According to speculative rumors and this FCC filing, it looks like Sony is planning to announce a new slimmer 4000 Series PlayStation 3 unit to the masses in the unknown future. Rumors have been circulating that Sony plans to reveal this slimmer PS3 as early as next month during Gamescom in Cologne, Germany.
The current PS3 is the 3000 Series. The model mentioned in the filing is the CECH-4001x.
The image below shows the new console in contrast to the current model which certainly reveals a much smaller version of the popular black box.