I noticed this this morning when I was doing my usual ritual of checking new DNA matches with my morning coffee. I was able to poke around with it a bit and have some potential avenues to look into with my brick wall 3xgreat grandmother.
However, I am taking these suggestions with a huge grain of salt, as it is more likely that the 4 DNA matches I have on this line may have guessed at the parents of their ancestor, as I am unsure what actual good documentation exists for this family.
My 3xgreat grandmother was Abigail (Hitchcock) Lapish. There was a prominent Hitchcock family that lived in the Wolfe Island/Kingston area of Ontario in the same timeframe, though I'd been unable to figure out where Abigail fit in. I believe there has been some evidence that her parents were Thomas and Margaret Hitchcock due to circumstantial evidence (I believe one of Abigail's daughters was listed in the Census with Thomas/Margaret at one point). I also got a single match at My Heritage that listed Thomas and Margaret Hitchcock in their ancestors.
This new Ancestry tool has pointed out 4 potential DNA matches to my mother - all very small matches at around a single 8-11 cm segment - that also list Thomas and Margaret Hitchcock as an ancestor. So this is more evidence, I suppose, though I am unsure when I can definitely point to Abigail's parents as being Thomas/Margaret or if this just adds more questions. I have to see if the estimated relationships (3rd cousins 1x removed and 4th cousins) are within the range for that small of a match.
And do research, as the Ancestry trees listing Thomas Hitchcock have him being born in 1790, which would be kind of weird since Abigail's year of birth is consistently listed at around 1815 or 1816.
This is a nice tool, to be sure. I do wish they'd add a chromosome browser, though.