Apple has released beta 2 of iOS 11.3 to developers, iOS 11.3 comes with a whole host of new features:
The options to disable iPhone throttling for degraded batteries
4 new Animoji’s
AirPlay 2 (partial support)
Other things in the beta so far is iMessage in iCloud however this could be pulled before the final release.
Apple has not released all of the features mentioned above yet but have said they will come in later beta’s.
Apple also has included a new notification of when an app or service is collecting personal information.