It looks like Samsung is not only on board with HBM, but that they're pushing hard to make it a success.
http://www.computerbase.de/2015-08/idf-2015-samsung-fertigt-high-bandwidth-memory-ab-2016/ <= it's in german
Not only will they mass produce HBM chips in 2016, but they even give us a hint at how the market could use it : Mainstream_ 2-4GB, Performance_4-8GB and enthusiasts_8-16GB.
Although they also think that GDDR5 will still be here for a few more years...
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.