iOS 27 updates cause temporary battery drain and device heat due to background indexing processes, particularly for Siri AI re-indexing, which may last several days. Performance returns to normal once setup completes, potentially with improved battery efficiency.
Apple's new Watch Ultra 4 and Series 12 models feature double the RAM of their predecessors—4GB compared to 2GB—a significant upgrade not mentioned in Apple's official announcement. The discovery was revealed through Xcode 27 analysis, as Apple typically doesn't publish memory specifications for its Watch devices.