The detachable keyboard portion now has a slot where you can charge a Surface Pen stylus.

This is a great idea, or at least it seems to be after checking out the Surface Pro X for a few minutes.

On the Surface Pro lineup, the Surface Pen attaches magnetically to the side of the screen, which is fine if you're on a desk. But the second you go mobile and put the Surface Pro away, the Surface Pen is likely to detach and join the random assortment of "things" at the bottom of your bag.

The Surface Pen for the Surface Pro X is much more secure in its little enclosure, and the stylus itself has a new, flattened design to fit in its keyboard enclosure. Better yet, the Surface Pen charges while it's docked.