Not sure how old that chart is, but a lot of the stuff in orange is listed as 2014, and haven't AMD just said no new GPU's for the rest of this year, meaning that the power saving stuff is already here in tonga, or its late and it wont appearing till next year. Of course if that part is late then then it stands to reason some of the stuff after it will be late as well.
Thats right, no more new GPU's this year, its October, 20nm are earmarked for Feb 2015.
None of that power saving stuff is in Tonga, the chart clearly puts them in, again. 2015.