I don't use Drupal so I'm really not familiar with its concept of taxonomy. If there is something unique about it please describe it so I can understand what you are looking for.
My concept of taxonomy is just tagging content with category labels and then having a possibility to browse by tags or categories from a list or tag cloud.
Currently we have tagging in the blog. My plan is to create an infrastructure for tagging in the core of mojoportal so that we can reduce the effort to implement it in each feature and then I wil implement it in other features like html content module and others.
The road map page outlines my general priorites, but I cannot give any accurate prediction of when things will be completed. I work as fast as I can and it will be done when its done.