Do you believe rumors about performance difference in docked and portable mode (from LKD, not Eurogamer)? Considering that Tegra X1's TDP was around 10-15W, custom P1's might be around 15-20W (if it has 384 CUDA cores vs original 256) which is not really hard to drive on the go in full throttle and even 4000-5000 mah battery can give you 3 hours of Skyrim. I just can't believe that every game would be able to change textures size and other settings depending if it's docked or no because of a seamless transition between these states – you can take console from the dock and play right away.
P. S. Resolution and draw distance? Maybe. Other things – no.