Die Walküre Cancelled in Oslo

Another cancel for the Norwegian Opera. We are getting used to it now. This time they cancel the semi concertant Walküre in February 2009 borrowed from Gothenburg Opera. Replacement: Die Fledermaus. Exciting to see if any Norwegians notice the change. (Another thing is it that there was no information about the production being semi concertant when I ordered tickets... but the web site is not