You can bet that it will be incrementally better... just like Maxwell was to Fermi. It, like previous generations, will be fine for gaming. The article even states that performance per watt is improved. Just how much in gaming is yet to be determined. Particularly in DX12 and async.
All the talk about scientific computing and performance per watt levees me to believe Nvidia does not have much to say about gaming performance, that is all I care about.
How many FPS was it from Maxwell to Fermi?