Over at NVIDIA's GPU Technology Conference, word spread along the grapevine that GDDR6 memory from SK Hynix is expected to enter mass production by July 2018. The new memory will reportedly be adopted by several future NVIDIA products, including upcoming self-driving car chips as well as most, it not all, next-gen gaming GPUs. This ties in well with the report from half an hour ago, about Turing GPUs launching towards the end of Q3 2018.
Given a mass production timeline of June-July for GDDR6 from SK Hynix, assuming Hynix is a launch-day memory provider, we can expect next-generation GPUs to become available after this timeframe. There still needs to be enough time to mount the memory to the boards, after all. We don’t have a hard date for when the next-generation GPU lineup will ship, but from this information, we can assume it’s at least 3 months away -- possibly more. Basically, what we know is that, assuming Hynix is a launch vendor, new GPUs are nebulously >3 months away.
GDDR6 will offer up to 16Gb/s but will be about 20 percent more expensive than GDDR5 at launch.