Widescreen, also known as 16:9, HDTV, 720p, 1080p, 13.333”x7.5”, among other names, is the new default aspect ratio in the new PowerPoint. To make your experience with the new dimensions pleasant, we’ve built a brand new set of themes specifically targeting this aspect ratio, and we’ve improved our conversion code so that you can easily make the switch to widescreen from other aspect ratios.
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There is no doubt that widescreen presentations are more impressive than the standard size ones.
The article gives evidence for it and explains how you can go from standard to widescreen size in PowerPoint 2013. It also gives tips how you can print handouts of widescreen presentations.