Just also thought about this.
Xbox 360 came out in 2005. The 360 has a 6 threaded 3 core PowerPC based Processor running at 3.2ghz. When the 360 was first announced PC's were still using single core processors. In fact when the 360 released only 1 or 2 PC's actually had a dual core processor.
Looking at this rumour it looks perfectly feasible. Basically we have 8 core CPUS on the market. By xmas 2013 there will be 16 core CPUS here.
When the 360 launched a dual core Pentium at 2.4ghz costed around $350. But yet the 3 core Xbox 360 was fantasticly priced for its power at the time. $479.99.
Durango:
16 cores, 4gb DDR4 ram unified, 256 EDRAM, 1TB HDD, liquid cooling, Windows 8, Kinect 2.0, DX12 GPU/13 ready.
Retail : $450 - $500. Easy.
In fact if Sony don't have something similar, then it'll be disappointing.
Xmas 2013 this is easily feasible. 8 core processors in 2013 Xmas will be well under $100 to consumer off the shelf. Let alone to Microsoft.
16 cores. Finally what I expected to have at that time.