Not the 350s, not the 750s.
That's right, these are the Yeezy Boost 550- slightly different than the Yeezy Boost 650 which recently leaked as well.
Just like the low-top Yeezy Boost 350s, the 550 features the familiar primeknit upper, including the contrasting streak. There hasn't been any released information announced for the Yeezy Boost 550 but these new, detailed images give us the feeling that they could be coming soon.
If you need your Yeezy Boost fix sooner than later, the high top "Grey/Gum" 750s are scheduled to launch on June 11th.