https://www.reuters.com/article/us-media-at-t-hbo-max-subscribers-factbo/factbox-which-hbo-subscribers-will-get-hbo-max-at-no-extra-charge-idUSKBN1X416D

Next week, when WarnerMedia reveals details about its upcoming subscription streaming video service HBO Max, some current HBO subscribers in the United States will learn that they will have access to the new service at no additional charge.