Assuming you are not looking at concierge level rooms...
Disney Wish stateroom info is available on the
DCL website:
https://disneycruise.disney.go.com/ships/wish/staterooms-overview/
There are two types of staterooms that definitely have the murphy beds in many or most of their rooms [we won't know exact # until booking is possible and people can figure out which rooms can sleep 5]:
Deluxe Family Oceanview Stateroom
Sleeps: 4 to 5; Size: 237 sq. ft.
Room Configuration: queen bed, single convertible sofa, upper-berth single pull-down bed and
single wall pull-down bed (for rooms that sleep 5)
Category 8B: Deck 8 and 9
Category 8C: Decks 6 and 7
Deluxe Family Oceanview Stateroom with Verandah
Sleeps: 4 to 5
Size: Approximately 284 sq. ft., including verandah
Room Configuration: queen bed, single convertible sofa, upper-berth single pull-down bed and
single wall pull-down bed (for rooms that sleep 5)
Category 4A: Decks 10 and 11
Category 4B: Decks 8 and 9
Category 4C: Decks 6 and 7
Category 4E: Decks 6, 9 and 10
Now, on the website they also list the Deluxe Oceanview Stateroom as having the single wall pull-down bed in some rooms, but I that would seem to be a mistake as there wouldn't be room for it in the room (look at the pictures they have - where would it go ?!!) ! However, for now at least in the description it does say "Room Configuration: Categories 9A, 9B and 9C: queen bed, single convertible sofa, upper-berth single pull-down bed
or single wall pull-down bed (if sleeping 4); Category 9D: queen bed and sleeper sofa". Contrast that with the description for the Deluxe Oceanview Stateroom with Verandah, which should be essentially the same stateroom but with a verandah, and its description says "Room Configuration: queen bed, single convertible sofa, upper-berth single pull-down bed (if sleeping 4)" which is what you expect for that room type based on the other ships and the pictures they have released.