Hi,
well I was looking for these changes:
1) Move categories to the root
Example:
Old:
domain.com/articles/category
New:
domain.com/category
2) Force styles on categories similar to the force style to forum function.
3) Wordpress-like tags (not XenTags).
Example:
domain.com/tags/iamatag
If you click a tag you should get the same pages when you click a category, meaning all articles with the associated tag.
4) RSS feeds for tag and category pages (just like wordpress)
Well, that's it. It would be awesome if you could reduce the use of queries a bit, but the other points are more important