Interesting, 1536 Cores?
The 970 has 1664 Cores, a difference of 6%, clock for clock that would result in a 4% difference in performance.
I would also question how they are going to do that, because of the way Maxwell is they have had to reduce the L2, ROP's and hack the memory to keep the 256Bit Bus from the GTX 980 to make the 970.
What they would also end up with is two GPU's with 'as near as makes no Difference' identical performance, so unless they are going to price them with in £5 to £10 of eachother the GTX 970 would be rendered obsolete, if they do price them in the same ball park they will only end up selling the same number of GPU's split between two different GPU
and either way would not have addressed the huge gap between the 960 - 970 sub £200 that the 380/X currently occupy.
I do
not wonder why that card has not been released.
The 1280 Core one would work better, its a difference of 30% in cores which would make it a little faster than the 380X but its quite a big hit to take on a 980 chip.