TSMC is already prototyping 7nm chips scheduled for production in early 2018
Customers interested in TSMC's 7nm chips include the likes of Qualcomm, Xilinx, and Nvidia. Apple is a likely potential candidate as well, seeing that the Taiwanese chip maker is reportedly tasked with producing 10nm chips for this year's iPhones. Current iPhone and iPad models utilize 16nm chips. The switch to 10nm will alow for smaller and more power-efficient microprocessors.
TSMC is expected to share more 7nm process progress information at the company's upcoming investor conference on January 15.
source: Apple Insider