This isn't even a report, this is an opinion piece. I doubt they'll implement a big-little architecture as they're already cramming a ridiculous amount of stuff on the SoC already. I do agree there is more than likely a move to 16nm but I think they will make the 2 cores bigger to account for another 25% increase in CPU (as evidenced by GeekBench), along with with whatever Imagination's latest GPU design is for a 50-100% increase. The cores are fast enough as is, and if they actually iron out iOS with iOS9, the need for more CPU won't really be there. I don't think Apple is in a spec race.
Keep in mind, the battery leak for the 6S shows a smaller battery (1715mAh vs 1810 for the 6). A die shrink to 14/16 would help accomplish the need for that, so the SOC improvements should be good, but not outrageous.
Thread title is misleading BTW.