IM PLAYIN took a look at the March Update beta a few days ago but, since then, they've found a few more changes.
"If you haven’t read it yet, a few days ago I wrote an article on the beta for the Xbox One’s March update. In all, I think that the changes are fantastic, and I can’t wait for my friends to get the actual update later this month – so that they can enjoy the shiny new changes and I can finally be in a party with them again. Since writing it, however, I’ve stumbled across a couple of other changes that aren’t overly obvious. See, I decided against reading about the update and what it entailed and chose, instead, to explore my console and find out for myself. These changes are less obvious and kind of hidden away, but they’re there nonetheless, and now they’re here."