AMD 2016-2018 GPU roadmap leaked
AMD's GPU roadmap for 2016-2018 has been revealed, showing that AMD plans on moving to HBM2 memory in 2017 and to a future NextGen memory standard in 2018.
Sadly this new roadmap does not give us any more information on AMD's upcoming Polaris architecture, but it does confirm that AMD will not be using HBM 2 memory and will be made with two new GPU core designs, which will each be made into several different SKUs that AMD can sell.
Initially AMD stated that they expected a 2x increase in performance per watt when moving past the 28nm Fiji architecture used in the R9 Fury X when that GPU was announced almost a year ago. Now AMD estimates that Polaris will have a 2.5x performance per watt advantage, showing that their Polaris GPUs are performing better than was initially expected on the 14nm FinFET manufacturing process.
AMD's Polaris Architecture is not listed as supporting HBM2 memory, with AMD's 2017 Vega Architecture being the first GPU listed with HBM2 support, meaning that AMD Polaris GPUs may be sticking with GDDR5 memory for Polaris, though GDDR5X remains a possibility.