Huge touchscreen displays aren't necessarily a feature of Office 2013, but the suite's stylus- and multi-touch-oriented UI enables it to work quite well with enormous LCD panels, such as Perceptive Pixel's 82-inch monster. PowerPoint presentations, particularly ones with embedded video, are a natural for large touch panels.
Educators may find large touchscreens useful too. A professor, for instance, could use OneNote in the classroom, jotting lecture notes and diagrams directly on a gigantic touchscreen; students could later access the notes via SkyDrive.
(Image credit: Perceptive Pixel)