The ability to edit presenter notes, while presenting, is now available on both Windows and Mac desktop apps!  In edit view, presenter notes are added, and edited here:

And when presenting, those notes display here in Presenter View:

What is new is the ability to in Presenter View click into the Presenter Notes area. The notes area gets a white outline, indicating the focus is there. While the notes area is the focus, the presenter notes can be modified!

This is great for all presenters and a great addition to the functionality of PowerPoint!

Troy @ TLC