Dell's XPS line has been part of the 13-inch ultrabook world since its introduction at CES 2012. In the six years that have passed since then, the line has seen a steady series of upgrades, largely just to keep up with the march of technology. However, the latest revision is arguably the biggest one the XPS has seen since its introduction. That said, Dell hasn't exactly redrawn the blueprints. The machine is still designed with portability at top of mind.