Dell could be looking at offering new aspect ratios aside from the standard 16:9 widescreen aspect ratio in future notebooks. This was confirmed in a conference call by Frank Azor during the new XPS and Alienware reveal. Opting for non-standard aspect ratios can greatly enhance the tablet mode experience especially in 2-in-1 notebooks.
https://www.notebookcheck.net/Frank-Azor-Dell-mulling-3-2-and-other-aspect-ratio-screens-for-future-XPS-notebooks.300550.0.html