Anthere-
Dan seems to imply german wikinews adopted editorials, but Elian said they seem to have stopped. I would be interested in knowing current situation :-)
I see no evidence that they have stopped. However, it's important to distinguish between "commentary" or "op-eds" and "editorials". See
http://en.wikipedia.org/wiki/Editorial http://en.wikipedia.org/wiki/Op-Ed
The German Wikinews published exactly one "editorial", signed by several members of the site when it started: http://de.wikinews.org/wiki/Wikinews:Editorial
This was basically an open letter asking people to give the project time to grow and develop, in light of the media hype surrounding its launch. Perfectly fine, in my opinion.
Then there's the so-called "Kommentare", which would be "Op-Ed" or "Commentary" in English: http://de.wikinews.org/wiki/Hilfe:Kommentar
These always have to be attached to a news report: You can't write an Op-Ed on anything. The last Op-Ed was published on July 19 http://de.wikinews.org/wiki/Kommentar:_Zickzack-Kurs_in_deutscher_Raumfahrtp...
You can see a list of all of them here: http://de.wikinews.org/wiki/Spezial:Allpages/Kommentar
The experiment is currently being discussed at http://de.wikinews.org/wiki/Hilfe_Diskussion:Kommentar
I've proposed an NPOV alternative to op-eds a while ago: http://en.wikinews.org/wiki/Wikinews%3ADebates
Best,
Erik