Patrick at GiantBomb recently sat down with Scott Rohde, Senior Vice President of product development at Sony's worldwide studio, to do a question and answer session about the PlayStation 4.
Tons of different topics are discussed including online passes, Sony's change to now charge for multiplayer, external hard drives and more.
In particular, it was asked if the PS3 USB peripherals such as FightSticks would work on the PlayStation 4. While Scott Rohde didn't know for sure he said "it is likely the PS3 peripherals will work on on PS4."
It was also asked if mouse and keyboard would will work on the PS4, Scott noted it was "somewhat likely." While this does not mean they could work with fighting games as with the PS3 you can use the keyboard to type. Many fighting game fans would love to be able to use a keyboard for different fighting games.