Alex Guyot, writing for MacStories:

The update includes support for the Apple Watch, improvements to the Health app, increased stability, and bug fixes.

Apple Watch support includes a new Apple Watch app (for us all to stare at longingly for the next few weeks), which is available on iPhone 5 and later.

The Apple Watch app doesn’t do much at this point, just a glimpse into the Watch pairing process and a few promotional videos in the Explore tab.

My experience with iOS 8.2 jibes with Guyot’s — it’s been incredibly stable during the few hours I’ve been using it.