Not only the Android Wear receive update today, so does the Apple Watch.
The Apple Watch received an update of app loading times improvment, faster data display in native and thir-party apps, as well as smoother and more responsive swipes.
Beside that they have fixed the Siri reply and accurately to your queries, tweaked stand activity to take more accurate measurements, calories tracking, and pace data measurements. There will be more emoticon available when replying to messages by swipe until the 4th Emoji slide and turn the Digital Crown to uncover hundres of smiley faces.
The update size is about 52 MB and will be updated thru your Apple Watch app in your iPhone.