While not quite the same font, the similarities between the "W" they used and the WordPress "W" are pretty noticeable.  Also, their product cluster logo (the colored lines) is completely arbitrary, and I don't think conveys a clear message.  Branding issues aside, there are definitely a few things I like about their redesign, though frankly most would be best suited as optional extensions that could be considered for addition:
 - Iconography for core functional tabs. Some of their icons make no sense, but in principal, I like the idea.
 - Highlighting/Quoting
 - Concept maps

Thanks for posting this, it's definitely interesting to see how others would redesign the site.

Nabil