If Microsoft introduces a new Xbox that can be upgraded further down the road (didn't Phil Spencer hint at an upgradeable console? If not, disregard this post). It would be interesting if the console itself has removable slot where the core processing sits (APU -zen cpu+gpu+hbm2). You take the 'core' out. what's left is the HDD, optical disc drive, usb ports, power supply, etc The motherboard with the "core" is like the size of the Radeon R9 Nano. I'm sure this has been discussed to death in other threads,
Another advantage with HBM2, it doesn't eat up transistors on die, like ESRAM does (right). Xbox One's 32MB ESRAM takes up 1.6 billion transistors, of the 5 billion total, and as we all know, 32MB ESRAM has not been ideal. A further advantage is lower power use. It's not as if this would be using an hbm2 configuration that maxes out the hbm2 spec (32 GB, 1TB/sec bandwidth). It would also likely to be considerably less than what Nvidia's using with the Tesla P100 accelerator (16 GB hbm2, 720 GB/sec bandwidth).
By late 2017, hbm2 should have long since been in mass production, with two suppliers instead of just a single supplier. (Samsung and SK Hynix). When it's time to do an upgrade, the next-gen "core" could be based on an APU with Zen 2, a Navi GPU and whatever that 'Nextgen Memory" is on AMD's roadmap. It's been said that Scorpio is a new architecture, what if that means not only a new cpu/gpu architecture, but way of handling console cycles.This would also be much less ambitious and more plausible than what Nintendo's Supplemental Computing Device patent describes for increasing the processing resources of a home console.
Food for thought. The Scorpio would still start as a 5-6 TF console.