There were some rumors earlier this year about Micron sampling GDDR6 memory but that turned out to be GDDR5X memory. Now VideoCardz spotted Hot Chips slides from a Samsung presentation that talk about GDDR6 memory launching in 2018. Interestingly, the chart puts DDR5 in the same timeframe, whereas a slide from the Intel Developer Forum talked about a DDR5 ramp up in 2020.
The GDDR6 memory chips will target a bandwidth of over 14Gbps, up from the 10Gbps currently offered by GDDR5. The new memory will also offer higher energy efficency.