XHTML2 no more backward compatible

I was reading an article at IBM development zone. An article claims that XHTML 2.0 lack of backward compatibility is actually a Good Thing. If you are front-end designers/developer who know and care about and use web standards and you feel scared about writing your HTML again into XHTML2.0 check out this article. It actually has some good point why they change <img>. I especially give warm welcome to xForms. :)