It seems that if you look at the column on the right of the page, you can see upvotes and downvotes separately for recent posts. The same [n, m] format is displayed for recent comments, but it doesn't seem to actually sync with the score displaying on the comment. This feature only seems available on the sidebar: looking at the actual comment or post doesn't give you this information.
Thanks, whoever did this!
Another recently implemented feature (in the same batch as the positive+negative separation) is users can now have a profile page which is loaded from the wiki (it seems to just be via connecting accounts with the same name).
As an example, gwern and matt.