Apple seeded iOS 8.2 Beta 3 (build 12D5452a) to developers on Thursday. Apple also released Xcode 6.2 Beta 3 With WatchKit.
iOS developers can download the new beta of iOS 8.2 via OTA on devices currently running the previous beta of iOS 8.2. They can also download it via the official iOS Developer Center. Users not registered with the iOS developer program will not be able to access the new beta.
iOS 8.2 Beta 3 includes WatchKit and Apple Watch support, suggesting the new version of iOS will not be released until the new Apple Watch devices debut in 2015.