There has been a lot of speculation over what the XML support in Office really entails. I think knowledge is really the key here, and I ask all of you who are interested to take some time to actually get your feet wet and understand the facts. I've made a number of posts over the past 3 months where I've tried to help explain the basics of the existing XML support in Office 2003 because that really helps to better understand what's coming in Office '12'. Conversations are obviously more constructive when we all understand what's going on (and aren't just basing our knowledge on random blogs and articles).
For those of you with Office 2003, you can get started right away. For those that don't have Office 2003, there are free online labs you can use where you basically get to play around with Office 2003 online: http://blogs.msdn.com/brian_jones/archive/2005/07/08/436880.aspx
Here are the different posts I've made that will help you all in better understanding what you can do, and how easy it is. I think if people played around with this more, we'd have less inaccuracies like the recent Myth of the Binary Key.
Here are the posts I made on Word's XML support:
I hope these can help with better understanding what you can do with the XML support in Word. Of course these are just introductions, and you can do a whole lot more. Let me know if there are other topics you'd like to see me go into. Have a great weekend.