I am not obliged to conceal my identity but will do so, I would like to guarantee that this information is sound as of the last 2 months but cannot; the silicon should be near final from what I am told.
What I will say will not necessarily be well received nor believed, my sole reason for this is the inability for the intelligent to actually see beyond the stem of misinformation based as accuracy. Further to mention that I am actually a fan of MSFT products and felt this should be said.
The leaks you have are accurate regarding the Durango v2.2 development kits but what has gone over the heads of many is that MSFT has incorporated a dual mainboard, dual APU system. Essentially MSFT will reveal a system with 2 times what VGL has leaked in one housing.
AMD have said the PS4 has the most powerful APU ever made right now, this is true, instead MSFT decided to go with a dual setup whilst Sony have overclocked to near 2.012GHz.
You shall hear more come March 6.