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 - Get Ready for New Types of Lists (Page 3 of 6 )
The <nl> tag is coming and it represents the new navigational lists. Navigational lists work so well because users select them in order to see more. It works like a menu. It has a <label> element that defines the heading for the navigation list. Something like this would be a list:
This is not the only new list. Definition lists have headings and list items below them. It defines four tags (dl, dd, dt, and di) but is fairly simple. Everything is in the <dl> tag and then you have a <di> for each section. The <dt> contains inline content (the heading) and the <dd> will then contain block level content. Something like this: