All my favorite bloggers have posted good articles about the changes in the Ancestry.com DNA pages. I have put a list of them at the end of this post.
The improvement in Ancestry’s DNA matching has greatly reduced the total number of matches, which ran into the thousands for many of us. The theory is that their new algorithm has gotten rid of those matches that were unlikely to share a common ancestor in the genealogical time frame. I am hopeful. And the new DNA home page for a person is much nicer looking and more informative as you can see below.
Looking at how my brother with one Jewish grandparent has fared, all his 4th cousin Jewish matches (dozens of those) are gone. This is probably correct. The few that I have been in contact with are not recently related.