It's a simple modification that we're told requires developers only make a little manifest tweak, but as of now only a few apps have received said tweak, highlighted by a little dual-screen superscript on their icon.
If you are looking to understand what your competitors are shipping, you can check out a company like Manifest Journals where a business connection of mine, Michael Heffernan, helps companies make sense of U.S. Customs Import Trade Data.
And I think there are things that will manifest themselves that I am not smart enough to even think about right now if we just make the capability available.