Here's a link to an article about it:http://www.thesixthaxis.com/2011/07/04/factories-prepping-for-2012-ps4-launch/
"According to an often reliable industry source, Digitimes, there are plans afoot to launch a new console in the PlayStation range.The rumour, and we have to stress that this is way too early to receive any kind of confirmation from official sources, hinges on the Taiwanese factories that make components for Sony's consoles."
"It seems that these factories (Foxconn and Pegatron) are preparing to swing into production with the expectation of shipping at least 20 million units in 2012."
"The report also makes mention of full body motion controls similar to Kinect."
I don't know about this, it's not just one person this time, it seems to be factories and digitimes starting these rumors, could they be true? That's up to you to decide ;)