VideoCardz offers a great summary of some other tidbits from the videos:
Vega can run on 6-pin power connector, but it wasn’t specified if they were talking about Frontier or RX Vega; Frontier will support gaming, but to take the full benefit from game optimizations, RX Vega is still recommended. Frontier will run in multi-GPU configurations, but it was not designed for multi-GPU gaming; Air-cooled and Liquid-cooled (gold edition) of Frontier have the same PCB design, although Liquid edition has higher TDP (375W vs 300W) and better operating temperatures; DIP switches on the back will allow you to change the color of the GPU Tach LEDs; AMD Rep did not want to reveal what the color of RX Vega will be; RX Vega will be launched on July 30th at SIGGRAPH