Microsoft has updated PowerPoint for iPhone today to allow future Apple Watch owners to control presentations from their wrists. The app allows the user to navigate between slides and see elapsed time or total number of slides in a deck.
Microsoft isn’t extending this new functionality to the PC and Mac. You’ll only be able to control presentations on an iPhone. Microsoft does have similar Office Remote functionality for Windows Phones to control presentations from a PC, so it’s possible the company may enable the same features on the Apple Watch in the future.