Good news: we've already updated the exams for Office 2007, and they're in market already! However, you probably haven't noticed it, because we were sneaky and changed the name of the certification to Microsoft Certified Application Specialist! You can find all the info you need at http://www.microsoft.com/learning/mcp/msbc/default.mspx.
Hope this helps,
Ken Rosen Lead Community and Evangelism Manager Microsoft Learning