We won't see the official word until tomorrow, but it looks like a done deal
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.
Ecma Office Open XML Document Format Appears to Win Approval as an ISO/IEC Standard: Final vote appears overwhelmingly in favor; input from 87 national bodies contributed to an improved specification.