This is the first comment that's made me actually want one...
In the article here they show Minecraft running at native res and 60 fps. No small feat nowadays considering draw distances that are popular now.
So I find it hard to believe that it will run with max settings / 60 fps on the new MBP, despite the lower native screen resolution.
The comments here also say 25fps on max settings in Stormwind: https://www.youtube.com/watch?v=mIbEIhizoXY
At native 4K and max settings, it's in the low 20's.
At 1920x1080 and max settings it's at ~35fps. To get it close to 60fps it needs level 7 details at 1920x1080. That's in non-crowded typical quest areas.