Oh well, here it is: yes, Virginia, the BND shared enormous amounts of surveillance material with the NSA, both from their military SIGINT group deployed with the German army in Afghanistan and from, well, Germany. Officially, this didn’t contain any information on German citizens. Also, the Germans offered the Americans the use of two software applications they developed, presumably as part of the deal for X-KEYSCORE.
Meanwhile, the Germans have given notice on an agreement from 1968 that permitted the western allies to request surveillance in cases that affected the security of their forces in West Germany. This document had apparently not been used since 1990 (they say). Oddly, the US and UK agreed immediately to terminate it by exchange of notes, but the Germans were still negotiating with France yesterday.