The Tech Report published a review on the Nvidias Pascal to use stacked memory, proprietary NVLink interconnect A quote from the article:

GTC Today during his opening keynote at the Nvidia GPU Technology Conference, CEO Jen-Hsun Huang offered an update to Nvidia's GPU roadmap. The big reveal was about a GPU code-named Pascal, which will be a generation beyond the still-being-introduced Maxwell architecture in the firm's plans.

 Nvidias Pascal to use stacked memory, proprietary NVLink interconnect @ The Tech Report