I remember when the original Xbox was coming out and they Dev kits started with an rough equivalent PC you needed to build and the slowly morphed into the actual machine over what seemed like 6 iterations.
Same thing with the 360. Real dev kits hit only a month or two before release for us. No clue how flexible the specs ever were during that period though. It was that you needed this type of card, this much ram, etc. Just like the PS 4 the first thing that was actual Xbox 360 was the controller.
I doubt anything will change but it could be that reported specs/hardware is the equivalent available devkit and not the actual machine itself. Who know though.
Really nice to know that the PS4 is clean and concise when it comes to the GPU, CPU, Ram, storage, and base input device. Glad that Cell is out of the picture and dev tools can mature and be shared across platforms with more confidence.