There is some work to be done. On the above clicking (diff) generally loads a page showing the previous version of the article vs the most recent. It won't work for us because we do not have write permission to the V12 project.
I'm looking into a solution. My gut tells me each update will be in the form of either a new article, or a new subsection in an article so it will be really easy to follow the progress. I.e., I don't foresee the donor article being updated again, but could be wrong. If it is, it will show in the second shot above.