There are presumably new DNA tests being taken on a regular basis - so, does Ancestry DNA update my DNA results with matches from the results of new tests ?
Yes.
In your DNA match list on the left of each entry there is a Green dot to show that there is a DNA match that you have not reviewed.
In the Filter section there is the option to check the “New” box which will also show the number of new DNA matches that you have received since you last checked. Just checked my Wife’s matches and she has had 7 new ones included in the last 7 days.
For me looking at new DNA matches is a task I undertake once a week with each of the DNA tests that we manage.
It is also worth remembering that DNA test kits are often given as presents not just for birthday’s but for Mother’s Day, Father’s Day, Thanksgiving, Christmas etc & this can result in a extra influx of DNA matches some 8 weeks later.