Prolific leaker Ice Universe just posted a side-by-side comparison of the Galaxy Note 20 and Galaxy Note 20 Ultra's camera modules. Based on the shape of the cutouts, the Galaxy Note 20 Ultra will get an additional laser autofocus sensor.
https://www.notebookcheck.net/Leak-confirms-that-the-Galaxy-Note-20-will-come-without-a-laser-focus-sensor.481192.0.html