Announce Messages with Siri
The first iOS 13.2 beta also reintroduces Announce Messages with Siri, which was pulled from the original iOS 13 release during the beta testing cycle. You can enable it in Settings > Siri > Search.
As far as what it does, it lets users have Siri read messages from an iPhone when H1-equipped wireless headphones are connected to it. It’s a hands-free system, which means you won’t have to unlock your iPhone first, either.