Google crazy roll out of features

One thing that pisses me off about Google is that the roll out of new features is random and, therefore, unpredictable.

I've seen a black menu bar in Gmail coming and going, the same with the blue bar in Docs and Reader and other services. Now, it's the people widget in Gmail that rolled out to only some accounts with unknown criteria and same is happening with the new Blogger interface.

I admit that the process is complicated but it would be great to have at least some kind of public roadmap to ensure that users know when they're getting improvements or new futures in their accounts.