Intel has announced Thunderbolt 3 will use the USB-C connector we've already seen on the MacBook.
Thunderbolt 3 arrives later this year once computer makers start shipping devices equipped with Intel's "Skylake" microprocessor. Skylake is the successor to Broadwell, the fifth-generation Intel Core processor that saw its debut on the Mac earlier this year. Thunderbolt 3 offers twice the bandwidth of Thunderbolt 2 — up to 40 gigabits per second, more than enough for a computer to drive an external 5K display, for example. Enough to transfer an HD movie from an external hard drive to your Mac in mere seconds.