Jesper Lund Stocholm is reporting that Denmark has decided to change their initial vote of "no" in September to "yes" for ISO approval of DIS 29500 (Open XML). Here is a pointer to the press release:

As Stephen McGibbon put it: "Denmark is a ISO/IEC JTC1 P member and has changed from 'Nej med kommentarer' to 'Ja'."

[Update 3/28 @ 1:21pm] Jasper H. Bojsen has a blog post in English giving all the details: