With HMC the bandwidth feeding mobile SoCs will far outstrip that delivered by GDDR5, 2013 is really bad timing for next-gen. We are on the cusp of a paradigm shift on the semiconductor side, performance is not going to increment but explode across the entire range of TDPs. Intel finally getting serious about mobile will aid that ramp.
I think this will have to be a 5yr cycle this time around since mobile will start to give comparable performance within 3-4yrs.
That might as well have been in chinese.