Registered Developers receive iOS 8.1 beta 2
Based on a screenshot from the update, it appears that iOS 8.1 beta 2 includes "bug fixes and improvements." Some of the issues that the new build is expected to take care of, include a problem maintaining a Bluetooth connection.
Apple has had problems with iOS 8 right off the bat. It had to remove all HealthKit apps from the App Store, and then released an update. But iOS 8.0.1 disabled Touch ID and the cellular connectivity of some Apple iPhone 6 and Apple iPhone 6 Plus users. So Apple sent out iOS 8.0.2 to fix those problems, but might have opened the door to another issue, as some have reported that their iCloud Drive documents were deleted after installing the update.