This is the sort of thing that can get lost in the shuffle, but it's something we all should care about.
Phones are no longer allowed in tournaments. Okay, that's the headline at least, but there are a few caveats. We're only talking about Competitive REL, meaning Day 2 of Grand Prix and the like, and you're still allowed to take a phone call if you need to, which is especially relevant if you have kids, or parents, or spouses or the like.
So while this may not be a radical change, it does mean no more consulting your phone for sideboarding notes in between games. You're going to have to make do with that list you hastily wrote down on a napkin.
What changes will this bring to the tournament scene? My guess is not a ton, but it's still an important policy shift you should be aware of.
You can find the full post, along with some clarification, here.