I have documented some of the new features: the space inset, natbib/jurabib, bibtopic and the new single quote approach. Would some native be so kind to review my english, please? BTW: I think it would be helpful to mark functional changes in the docs. One approach which is often used in LaTeX docs are marginal notes like "New/Changed in v. 1.4".
Since the patch is 136KB (gzip'ed), mostly because of the file format changes, I have uploaded it to http://www.spitzmueller.org/misc/doc.diff.gz Regards, Jürgen P.S.: editing the UG with 1.4 is a real PITA. It is soo slow!