This morning, I posted the final customUI XML schema for creating Office 2007 RibbonX-based solutions.
You can use this schema to develop solutions that will work with the upcoming final release of Office 2007; it will also continue to work just fine with Beta 2 Technical Refresh. The changes from the previous version I posted are all minor (and in fact I updated the B2TR link in a previous post to point to the updated RTM schema as well.)
Download the RTM customUI Schema
This updated version will also find its way onto MSDN in the coming weeks, but I wanted you guys to have access to it first.