I decided to undertake the editing of RFC3530bis, which is a second effort on RFC3530. The intent is to make the document cleaner, but to not introduce any over-the-wire protocol changes. (We have NFSv4.1 for that.)
The main effort so far has been in taking the text version of RFC3530 and converting it to XML. The reason to do that is that it really makes it easy to organize the layout. Effectively, this is just like keeping my thesis in LaTeX. Plus I always love compiling a document. The previous version of the document had been maintained in troff and the known source was out of sync with the official document.
So now you can look at the documents here:
The first major change was the pulling of the XDR description of NFSv4.0 out of the main document and into a separate one. That allows for the easy creation of your own .x file from that document.