This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
It is a workflow tool and has more features than CVS/SVN
I first heard about it in your post; it isn't in widespread use.
The website says it is intended to be a replacement for Rational ClearCase. Almost everyone I know that has used ClearCase has bad things to say about it. Some are product specific. And some are a workflow tool injecting itself into how you do source control.