As of today, Walt Disney World has updated its website to reflect a future change in face mask policy:
Facial coverage is required for all Visitors (from 2 years old) and cast members, including those who received the COVID-19 vaccine. Please bring your own face protection and wear it all the time, except for dinner or swimming. You can temporarily remove the cover from your face while eating, drinking or taking a photo outdoors *, but you should be still and maintain proper physical distance during this time.
(* As of April 8)
DisneyWorld.com
Walt Disney World has strongly imposed the use of a mask when taking pictures in parks and beyond, but now, as long as you have enough distance from others, you can temporarily remove your mask for an outdoor photo. Obviously, this rule does not apply to indoor locations where the spread of COVID-19 would be more difficult to mitigate.