Been jonesing to create your own Apple Watch software? It's time to get cracking. As promised, Apple has released WatchKit, the toolbox you need to develop apps for this next-gen wristwear. The utility (tied into the iOS 8.2 beta SDK) lets you take advantage of most of what the Apple Watch can do, including pressure-aware touch, notifications and glanceable info. You won't get to publish your apps until next year, but you can start experimenting today.
Update: Not surprisingly, early adopters are learning new things about the Apple Watch through WatchKit. Steve Troughton-Smith, for example, has discovered that the two Apple Watch models use different screen resolutions; the 38mm version displays at 272 x 340, while the larger 42mm model uses 312 x 390. Also, a lot of the processing for these early apps happens on your iPhone; they're just projecting an interface to your wrist. You'll have to wait until sometime in 2015 for truly native titles.