Hi!
I think, it would be very good, if HTML5 uses some of the good ideas of XHTML2. Like e.g. the <h>-<section>-model that is better than <h1> - <h6>, <separator> instead of <hr>, removing the <font>-element and the <iframe>-tag, ...
A list of more great things, that HTML5 could use from XHTML2 is found here:
http://www.xhtml.com/en/future/x-html-5-versus-xhtml-2/
Best wishes for the standards-development...
Felix