The term 'extradition' may be a bit misleading here. Extradition applies to people who are under arrest or in jail (he is not) and describes the process of transferring people to another country even against their will (which may or may not be the case). As far as I understand the ruling by the Bundesgerichtshof (not the constitutional court in the country, just the highest court in administrative matters) merely says that the NSA special committee of the Bundestag (Federal Parliament) needs to bring forward the request for a hearing of Edward Snowden to the German federal government. From thereon are two possibilities: if the German federal government agrees, they have to allow for a safe transfer. If they don't the case may likely go to the constitutional court.