Thanks to Lars for pointing me to this article. It’s a great insight on managing large teams over different locations efficiently. In his November 2012 article, Henrik Kniberg (also see my recent post from him introducing scrum) describes a team setup that combines scrum teams and keeps them interacting with each other.
It’s a challenge I’m currently facing as well setting up the new car2go and moovel development teams. I’ll definitely learn from that input for my further steps!