Although there are still very few details regarding the unannounced PS4, one piece of information seems to have slipped through.
The codename for the next-gen console is rumoured be Thebes, not Orbis as was previously thought.

The only other information that really seems to be known about the PS4 is that it will be using an AMD CPU and GPU

Website SemiAccurate reported that: "It is said to be a 28nm part, likely fabbed at Global Foundries or IBM for the first run, and out after Oban. That would most likely be the spring of 2014, but it could be fall of that year too."
For those of you that were not aware, Oban is the codename given to the Next-Gen Xbox chipset.

It's also a bit of an upset that the report seems to date the PS4 for release in mid to late 2014. This may anger those who were hoping that the 2013 holiday season would mark the start of the next gen console war.
A speculated reason for this might be due to the fact that both Microsoft and Sony seem to be using AMD to create the chips for their next consoles.

Microsoft seems to have called dibs for first in the queue.