Since the release of the PS4, Sony has been able to already sell 7 million units and admits they can't keep up with the demand yet. This is good news for Sony as some of their other divisions have been dragging them down and the success of the PS4 might help that temporarily. Phys.org has the full story.
The PS4 is up against Microsoft's Xbox One, and Nintendo's Wii U for dominance of the digital home entertainment market at a time that consoles are under intense pressure to prove their worth in a world of ubiquitous smartphones and tablets for games and videos.
By comparison, the Wii U, launched in late 2012, took more than a year to sell 5.86 million units.