Code found in the latest beta of macOS Sierra confirms the presence of Thunderbolt 3 in future Macs. This was found in a localizable text string by 9to5Mac. Not only does the string point to Thunderbolt 3 coming in the future, but it also references something called “Super Speed Plus,” another name for USB 3.1 second generation. USB 3 gen 2 supports speeds up to 10Gb/s, up from 5Gb/s with the current USB 3.1.
The news Macs featuring this technology are expected to come sometime later this year. One date that Apple might be planning on announcing these devices could be in September alongside the iPhone 7. One device these ports might be meant for is the new MacBook Pro with Touch ID and an OLED panel.