One of the major improvements over 0.10.4 is the Genshi template system allowing complete control over a site's HTML. For example, you can copy the default
layout.htmlto your site's
templates/directory to remove the obnoxious "Trac" string at the end of every page's title and the other Edgewall advertising splayed all over a default Trac site.
Of course, this is also means a Trac site can be radically redesigned in structure without editing the source code. Hopefully this leads to a greater diversity in project site design.
Another major feature is ticket workflows are now customizable, allowing projects using Trac to decide how their tickets will be processed. For example, a "testing" state could be added to signify a ticket as "though to be complete, but waiting for verification".
I plan on upgrading pysoy.org this weekend along with a few new Trac plugins and a minor site redesign.