PowerPoint 2013 has updated itself to use widescreen presentations as its default (which I believe is good). And the PAGE SETUP has changed as well. The aspect ratio is the same (16:9). My friend, and Microsoft PowerPoint MVP, Echo Swinford has a great description of the page setup change here.
![](https://thepowerpointblog.com/media/blogs/all/13_Mar/SizeMatters.jpg?mtime=1363792554)
– Troy @ TLC