macOS SierraApple presented macOS Sierra 10.12 during the World Wide Developer Conference (WWDC) 2016 in June 13, 2016.
I could not find information about smart cards or CryptoTokenKit API in Apple Sierra preview page or Wikipedia Sierra page. I am not surprised. Smart cards are far less used than Siri for example :-)
I already wrote about the CryptoTokenKit API when this API has been introduced in "OS X Yosemite BETA and smart cards status" in July 2014, 2 years ago.
It looks like the CryptoTokenKit API is more mature now since the documentation is available as web pages (and not just
CryptoTokenKitThe API documentation web page is "CryptoTokenKit Access Smart Cards and manage user interactions."
A lot of functions are marked as Beta. So I would expect some/many changes between the beta version(s) of Sierra and the official Sierra release planned for fall 2016.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.
ConclusionOnly Apple developers have access to this first Sierra beta version. Because of the Apple NDA I can't write about information not already public.
A new beta version of macOS Sierra should be available in July 2016. This time it will be a public beta for everyone. More information to come...