Dotnetnuke navigation provider is also upgraded with many new releases of dotnetnuke. I come across some nice demo of all new features. Now you can create an entire menu css using a single attribut in dnnNav control with CSSControl attribute. There are some good tutorial video to learning this new feature at : http://www.codeendeavors.com/. MimimalExtropy skin in download section of this website is very usefull for learning the new provider.
Hope this also help you.