Looks like the rumour mills have been in overdrive over the last few days. The most amusing that I have read is "Microsoft cuts Ribbon in Office 2007" which is incorrect for 2 reasons. First, the ribbon has NOT been cut from the UI and second it's the 2007 Microsoft Office system and not Office 2007 (a minor correction but lets try to be correct here).
I stumbled across an article that talks of changes that we have made to the Ribbon in the upcoming technical refresh that have taken onboard feedback from existing beta users. It looks as though this one isn't quite as bad as the some of the other articles that are out there as it looks as though it is at least based on some correct facts.
For the truth behind these rumours about what we have changed or not changed or was there all along please pop along to Jensen's blog.