A redditor going by the name of morphinapg has designed a mockup of the PlayStation 4 next-gen console based on close up images from the teaser video, released just a couple of days ago—and again yesterday before the Xbox One event.
He explains that he first started studying the images from the teaser and the one thing he deduced was that the top of the console was made of at least three materials: a black glossy material, a dark grey matte, and a light grey glossy material. It became clear later on that the rest of the console was covered in dark grey matte.
He further explains how he put the rest of the thing together, such as where the fan placement, and the ventilation shafts would be.
From what I can tell, the image looks fairly close to what's depicted in the teaser trailer. Though with that said, the artist's impression could be completely wrong and the PlayStation 4 may look nothing at all like what he's envisioned. It's hard to say what it actually looks like, so we'll have to find out when they reveal it for real on June 10 at E3 2013.