Distributed version control systems are not exactly new. They have been around for the last 10 years, but they haven't yet penetrated Enterprise where Subversion and CVS still hold sway. There are some conceptual reasons for this. Mostly the concept of control, swiftly following by the concept of money.
Open source distributed systems are free, which flies in the face of enterprise profit making, and that has made them suspicious to businesses who need dedicated support, funded roadmaps, corporate regulatory compliance, and the fact that they are mostly coded by guys who take a certain pleasure in making gifs that paint the suit wearing procurement manager as slightly less than intelligent.