It's been known for some time now that NVIDIA's next-generation Pascal GPU will adopt HBM2 but now WCCF Tech claims it scored some new information. The site says Pascal will be made on a 16nm FinFET process from TSMC and heard it will have a 4096-bit memory bus, similar to AMD's new Fiji lineup.
Pascal is expected to have two variants: a consumer GP100 edition with 4-Hi HBM2 clocked at 1GHz effective, this means the memory consists of a stack of four dies. Then there will also be a version with a stack of eight memory dies, this model is designed for the Quadro and Tesla markets and will offer higher memory capacities.
Other than that a lot of questions remain about Pascal and it will be interesting to see if there will be supply problems as the rumor mill claims AMD secured priority access to HBM2. Expect a launch sometime in 2016.