It is the opinion of multiple professionals that WideIO memory is coming to the PS4 with stacked memory on transposer connected to CPU/GPU and possibly (my opinion) a second GPU on the same transposer.
This is my dream configuration for the PS4. I don't think it'll happen but it would be sweet. The multiGPU setup on an APU may be why a lot of engineers are more excited for the Durango GPU. It'll likely be a bit more engineered for various, special tasks whereas Sony may just be brute forcing it through higher end off the shelf parts. AMD may also not be too excited about it if Sony is the ones that came up with the multiGPU setup, like in the patent from the other day. Sony is a hardware company so they could be doing a lot more of their own work than Microsoft is.
I want a full 64 player BF4 for next gen launch so badly.