The famous site DigiTimes said that they have information that ,Sony started manufacturing a PlayStation 4, which will be unveiled and sold in 2012
After about 6 years from the disclosure of PlayStation 3 the original which seems too early especially as the PlayStation 3 has recently started in the profit and the rate of adoption began to rise a little but did not reach the level of PlayStation 2 in the success, Sony has already said that the age of PlayStation 3 would be 10 years.
Sony did not talk much about PlayStation 4, but already it has stated that it started to work on the PlayStation 4 without any details or release date.
