The current dgpu in the 15 inch cant even run Overwatch well at high settings, what makes you think the skylake igpu can when its around the same performance or even weaker? It can only get 60fps with low settings which is pretty bad
There is a video floating around of a dell xps 13 running overwatch at 30 fps (by no means super amazing, but not bad either) on integrated graphics
EDIT: @WRONG already posted it