Microsoft: OpenXML "appears to win approval as an ISO/IEC Standard"
Here's the press release which notes that
After more than 14 months of intensive review, a Joint Technical Committee of the International Standardization Organization (ISO) and the International Electrotechnical Commission (IEC) has concluded its formal process to evaluate Ecma International’s submission of the Draft International Standard (DIS) 29500: Office Open XML (Open XML).
While the final vote has not yet been announced formally, publicly available information appears to indicate the proposed Open XML standard received extremely broad support. According to documents available on the Internet, 86 percent of all voting national body members support ISO/IEC standardization, well above the 75 percent requirement for formal acceptance under ISO and IEC rules. In addition, 75 percent of the voting Participating national body members (known as P-members) support standardization, also well above the 66.7 percent requirement for this group. Open XML now joins HTML, PDF and ODF as ISO- and IEC-recognized open document format standards.
“With 86 percent of voting national bodies supporting ratification, there is overwhelming support for Open XML. This outcome is a clear win for the customers, technology providers and governments that want to choose the format that best meets their needs and have a voice in the evolution of this widely adopted standard,” said Tom Robertson, general manager of Interoperability and Standards at Microsoft Corp. “The input from technical experts, customers and governments around the world has greatly improved the Open XML specification and will make it even more useful to developers and customers. Once it is formally approved, we are committed to supporting this specification in our products, and we will continue to work with standards bodies, governments and the industry to promote greater interoperability and innovation.”
Brian calls the news "the end of the file formats war". Now what was that phrase again? "Yip yip yahoo" 
The future of documents, and the ongoing development of IS 29500
I have to admit that what I'm most excited about is that we can now start to move beyond the basic discussions of file formats as they relate to what are essentially digital typewriters, and start to move into the future of document content. The custom schema support in Open XML is really just the starting point of semantic documents, and it takes a small step in the new voyage we need to help convince the rest of the world to take. For far too long, we've focused simply on how to present document content. How it's formatted, where page breaks are, and what styles are used. We've only begun to scratch the surface though in terms of the actual semantics behind the documents people create. There are brilliant folks out there who've been doing a lot of thinking around the semantic web, and how to really tie together all the important information that affects our lives. The next challenge is to really identify how you get the average document author to write content that is semantically structured. Most folks don't yet see the advantage in structuring their documents, so it's important to find ways of providing immediate benefit to those that take the time (or use the right software). There are a number of experts in this area on SC34, so it's very fitting that many of the same people that have helped contribute to this area will also participate in the future developments of Open XML. In ISO it's called "maintenance" but I think that term sounds a bit limiting to folks. It's not "maintenance" in the way that you maintain your car so that it runs properly. Of course some of the work will be around corrections and general improvements, but a lot of the maintenance work will be innovative and forward thinking. We need to continue to move document formats forward, and I couldn't think of a better group to take on that responsibility.
Jason has posted "IS29500 - Open XML Is An International Standard" in which he writes:-
This standard has received more technical and political attention than any specification in the history of the ICT industry. Genuine industry competition around office productivity applications fed a heated exchange of technical considerations and philosophical positions regarding standardization, intellectual property, and most certainly document format technology. In the end, all of this – from the most ardent critics to the dedicated supporters of the specification – contributed to the improvement of the Open XML specification which ultimately led to its adoption as an ISO standard.
This is though, just the end of the beginning. I am sure that both OpenXML and ODF have bright futures ahead of them as we make the new world of documents a reality for all.
Looking at the "unofficial" results it seems Europe gave phenomenal support, with not a single disapprove. I'll comment more on that when I've seen official results.