CEO Arne talks about that & more here:
Among other things, it states:
A NEW RESERVATIONS SYSTEM IS ON THE WAY
Sorenson also revealed additional details about the new reservations system, ERS, that he previewed at the Skift Global Forum in September. The new system, which is modeled after an attribute-based booking system, has the potential to help Marriott boost direct bookings.
“Our new enhanced reservation system, which we call ERS, has been rolled out to over 500 hotels. ERS allows guests to select rooms based on a greater variety of room characteristics such as bed type, view, high or low floor, corridor room, balcony and so on, with more photography and hotel descriptions allowing greater customer choice and more effective marketing.”
Also a video below: