Sony said a lot about the PS4 at their dedicated conference about the console - one thing they didn't show which everyone was waiting for is the console itself. They said what will be in it and showed off the new DualShock 4 controller, but didn't show us anything on what the console will look like.
Today they have released a little teaser, showing off parts of the console. All will be unveiled at E3 this year. It's pretty exciting.