https://wccftech.com/amd-gddr6-memory-upcoming-graphics-cards/

A rumor recently surfaced involving the LinkedIn page of an AMD technical engineer that listed the company working on a GDDR6 memory controller. I reached out to some people and can confirm that AMD is indeed working on the GDDR6 standard and will be actively using it in future graphics cards. As for the question that I am sure everyone will ask next, no AMD will still be sticking to HBM2 for its high end next generation graphics cards in 2018 (aka Navi).

The leak originally stemmed from a picture of a LinkedIn profile showing an AMD engineer listing the GDDR6 memory controller technology in his portfolio. This is usually a fairly obvious way of confirming a leak but the profile in question was nowhere to be found. This is why I decided to reach out to sources familiar with the matter myself and can confirm that AMD is indeed working on GDDR6 memory technology and will be adopting it.