I've just written about SK Hynix's new dates for HBM2 deployment, which will affect AMD's Vega GPU roll out a little, but we're still getting Vega graphics cards in Q2 2017.
AMD confirmed the news during their latest financial report, where they said: "AMD introduced preliminary details of its forthcoming Vega GPU architecture designed to address the most data- and visually-intensive next-generation workloads. Key architecture advancements include a differentiated memory subsystem, next-generation geometry pipeline, new compute engine, and a new pixel engine. GPU products based on the Vega architecture are expected to ship in the second quarter of 2017".
As for the new Vega graphics cards with HBM2, we should expect 8GB of HBM2 with just under 410GB/sec bandwidth - and a release later in the year with the faster 512GB/sec HBM2.