Thanks for bringing up this topic. It's long overdue that WordPress revamps their theme page. I teach a WordPress class, and one of the most difficult things to show students, is how to search for themes. One of the easiest ways to revamp the theme page is to rethink the tagging system for WordPress themes. The advanced search and list of tags are totally out to date and incredibly lame they don't even have responsive on the list. Also it seems that the theme developers don't apply all the tags that they could to their themes. It would be cool if the WordPress theme reviewer could also add tags. Once we have enough usable tags, there could even be a tag cloud page, similar to what they have on the showcase page. And speaking of the showcase page, how about a way to see WordPress.org themes in the wild, that would really be helpful.