It goes back even farther than that!
Here's an article from 2010 reporting Seagate promising 100TB HAMR hard drives:
Here's an article from 2006 reporting Seagate promising HAMR hard drives in "a few years":
Also I'm puzzled by the claims about hundred layer 3D NAND chips. I can see how a hundred-layer chip would increase density and therefore could reduce access latency, but I don't see how it could significantly reduce cost-per-bit. Sure, there will be a hundred times as many bits per square cm, but a hundred times as many manufacturing processing steps should be required to make it, thereby increasing manufacturing cost a hundred-fold. Also, with all those manufacturing steps, the chance of defects also goes up, thereby reducing yields and increasing costs even more. Reduced latency would be cool, but I don't see it reducing cost-per-bit by much, if at all.
Also, Intel seems to be peculiarly self-contradicting when discussing their 3D XPoint technology. In 2015 they claimed that 3D XPoint was NOT phase-change technology and that it was already in volume production to prepare for sale in early 2016. In 2016 they're claiming that 3D XPoint IS phase-change technology and will not enter volume production until 2017.
I've become very cynical about all this. Frankly, I'll believe these things when I can see them with my own eyes.