Techcrunch has detailed take on it.
Google+ is not yet available to the public. The web interface is not yet ready, the Android app is under “active development“, and the iPhone app is “coming soon”. I doubt if they have even already submitted the app for Apple’s approval.
Frankly, I find Facebook to be already over-saturated. And we might just need a clean and fresh look of a new system where we could hang out with real people — people who we really know in person and have interacted with.