According to a report by BusinessKorea TSMC has been selected to produce the upcoming Pascal GPU after initially competing with Samsung for the contract.
Though some had considered the possibility of both Samsung and TSMC sharing production (albeit on two different process nodes, as Samsung is on 14 nm FinFET), in the end the duties fall on TSMC's 16 nm FinFET alone if this report is accurate. The move is not too surprising considering the longstanding position TSMC has maintained as a fab for GPU makers and Samsung's lack of experience in this area.
The report didn't make the release date for Pascal any more clear, naming it "next year" for the new HBM-powered GPU, which will also reportedly feature 16 GB of HBM 2 memory for the flagship version of the card. This would potentially be the first GPU released at 16 nm (unless AMD has something in the works before Pascal's release), as all current AMD and NVIDIA GPUs are manufactured at 28 nm.