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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Are you posting in the right place? Check out Where do I post X? to know for sure.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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