But apparently while I was writing and likely minutes before I hit my publish button Ancestry.com hit the publish button on its own blog. I discovered this less than ten minutes after publishing my post.
Now the answer is clear. The "Shared Matches" are those shared in common between your test that you are viewing and that selected DNA match.
Apparently there is supposed to be a Father and Mother filter if you have tested your father or mother. I have my mother tested but I don't have a Mother filter yet. I suspect this is because it will take a few days or more for Ancestry to catalog/index the matches in common for each test that you manage.
Here's a link to Ancestry's video about the new feature to learn more about the new feature.
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