Warner Bros. World Abu Dhabi put a date on three new themed lands. September 7.
It showed up as a surprise teaser in the official Harry Potter Back to Hogwarts showcase (they livestreamed it from London this morning). Attractions Magazine wrote it up. This is NOT the land drop. They did not name the IPs or the rides, and they did not give an opening year.
That park is the indoor one on Yas Island, and it already has six lands, mostly DC and Looney Tunes. They have previously confirmed a Harry Potter land is in development there, first in the Middle East and the first outside a Universal park. The National was even writing about that land this morning as fans gathered in London. But the showcase teaser did not say Harry Potter is one of the three. So I would not count that as confirmed.
September 7. Guess we will see if they actually name them.