OK efcop - read that. I originally understood your post to mean that 15 aircraft would be grounded tomorrow!
On more careful reading, I see that it means the decision is to be taken tomorrow. In the paper it said, "15 Flugzeuge (sollen) aus dem Verkehr genommen werden " - taken off the route (at some stage). Well it's bad news for the airline but not as drastic for the customers as had they been kept on the deck tomorrow...
They go on to say that it will mainly be "small Saab machines but also certain medium range Airbusses".
Could just be getting a bit more orange around ZRH.