Well, this is new to me, at least. I have used powerpoints in class, but this add-on allows you to do some different things with the software. I hate to compare this to Prezi, but clearly that is the only comparison to be made.
It is called pptPlex, and is a free add-on from Microsoft. Below is a video of my first use of pptPlex.
If you want some better introductions / helper videos on how to use pptPlex, I have some links below for you.
Official Microsoft videos for pptPlex below