The first beta of iOS 10.2 was first released at the end of October and it looks like that we will more beta seeds of this version until it’s released publicly which will at the end of this year.
The beta 6 of iOS 10.2 will be available for devices as an over-the-air update that are part of developer program or have an apple developer id. It will be also available for public beta testers and it will also available as an OTA update on devices which have the previous version of this iOS 10.2
As for new features and changes, they are yet to be explored and discovered. If anything new is discovered then we will update you ASAP.