Although XHTML 2.0 isn't ready for general use yet, understanding how the changes will affect your writing and code will be key to a smooth transition. With full XForms integration, separation of content and function, and other features, XHTML 2.0 promises to revolutionize the Web when XHTML 2.0 arrives.
XHTML 2.0 Explained - Making the Switch (Page 2 of 6 )
In XHTML 2.0, a lot of tags are being removed from the DTD and others are being introduced. There will be no more <img>, <b>, <i>, or <br />, tags, as well as others. Once again, the idea is to separate content and layout completely. Here, we will just go through the basics.
No more <img> tags?
The <object> tag has already replaced the <applet> tag and other similar tags, but now it will replace the <img> tag too. Instead of...
<img src = "someimage.png" alt = "Some Description" />