We saw Google Voice integration go live last night, but it contained a number of issues which this update is expected to fix. Yet as exciting as this is, what's more immediately striking is the new visual redesign.
With the amount of smudging this post required, I feel like I've been working on classified documents. The new version of Hangouts plasters your email address absolutely everywhere. It's not an issue when using the app, but it does make for some rather swirly screenshots.