ARM said the same about the new Cortex A72 core but according to Qualcomm/Mediatek their new SoCs will be featured in commercial devices in second half of this year.
Samsung was the first to use A57 and Mali T760 in a mobile SoC, if someone can pull off A72 + Mali T880 this year I would bet on them (Galaxy Note 5 @ Q4-2015).
They certainly need something powerful. The way I see it Mali T860 is more about improving efficiency than performance and I'm not sure if they can push Mali T760 much further when MP6 is ~30mm² @ 20nm - a MP10 or MP12 config won't be very small @ 14nm compared to competitors and we're already dealing with >700MHz clocks (Exynos 7420). Mali T880 fits the bill perfectly, fingers crossed.
-but if they planning to do so, then what's left for s7?
-since i don't know much bout hardware stuff, i have a question: is that possible combining the old cortex A57 with a newer gpu like mali t860? in this case they can do so for the note 5 , and save the newer cortex A72 and mali t 880 for s7 i may look like an idiot by saying so but as i said i don't know enough regarding hardware possibilities