MLG operates MLG.tv, the #1 online broadcast network for professional level competitive gaming; the MLG Pro Circuit, the longest-running eSports league in North America; and GameBattles, the largest cross platform online gaming tournament system with 9 million registered users across the globe.
Keeping the Surface Connect port and making the Surface Dock compatible with the Surface Pro 3 in the process instead of replacing it with a symmetrical and reversible USB-C port is a tradeoff I posit Microsoft thinks is worthwhile at this stage.
As for tech specs, the Surface Hub has fourth-generation Intel Core processors (i5 for the smaller model, i7 for the larger), Intel HD 4600 or NVIDIA Quadro K2200 graphics, 128GB of solid state storage, 8GB of RAM, four USB ports (USB 3.0 for two of them), Bluetooth 4.0, 802.11n Wi-Fi, and gigabit Ethernet.