Scheduled to roll out today (September 16) alongside the iPhone and iPad-friendly iOS 9 patch, the watchOS 2 has now been officially pushed back by Apple at the last minute.
"We have discovered a bug in development of watchOS 2 that is taking a bit longer to fix than we expected. We will not release watchOS 2 today but will shortly," an official Apple spokesperson told Digital Spy.
Despite confirming the delay, the iPhone 6S maker has failed to confirm when exactly we can now expect the first major Apple Watch software update to land.
Introducing a number of new features and functions, watchOS 2 will enable existing Apple Watches to run new third-party apps, offer photo-based backgrounds and run a new Nightstand mode.
The iOS 9 update is still scheduled to begin its widespread introduction at 6pm BST this evening.