Today apple dropped iOS 12.1 beta 1 to registered developers. Its size is 2.76 Gb on iPhone X and around that size on other devices. The build number for this beta is 16B5059d.
In terms of the actual features it didn’t bring anything noticeable as well as the visual changes did not occur this time. The only feature that has been brought back is a Group FaceTime. Not that long behind Apple had issues with this feature and removed it from iOS 12 to work on it for longer to make it stable and complete. In terms of the performance, users haven’t seen major differences between iOS 12.1 beta 1 and iOS 12. So gonna be waiting for more iOS 12 releases, stay tuned if you’d like to see more coverage!
The Profile for installing beta can be directly downloaded from apps4iphone: http://www.apps4iphone.net