Apple is releasing iOS 8.2 with support for the Apple Watch today. The update is a minor one, but it's something that anyone planning on buying an Apple Watch will want to download soon: the watch requires connection with an iPhone, and the iPhone must be running iOS 8.2 for it to work.
Other than that, the updates here are limited. There are stability improvements and bug fixes, and there are some minor changes to the Health app, but by and large, there's nothing here that most people are going to notice. Apple's next big changes are expected in iOS 8.3, which will bring wireless CarPlay support and a new emoji keyboard that's absolutely going to up your emoji game. It's also been reported that iOS 8.4 will bring with it a new music-streaming service based on the Beats Music app.