IIRC, xhtml 2 removes everything that was marked depreciated in HTML 4.01, which is a major huge change, both in as much as it changes a lot, and in as much as it seemed, prior to that, to support everything that had ever been in common use.
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I'm no expert, but theorbittwo's assessment sounds about right to me. All in all there are some pretty weighty changes.
For example, check out this little gem from the xhtml FAQ...
Is <img> being replaced by <object> in XHTML2?
No. <img> is being replaced in XHTML2, but by something else ...
What XHTML2 does is say that all images are equivalent to some piece of content; it does this by allowing you to put a src attribute on any element at all. What this says is: if the image is available, and the browser can process it, use it, otherwise use the content of the element. For instance:...
Take a look at the elements in xhtml2 to get a sense of how much has changed.
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