I believe the wdw site & phones will be unavailable as well on the same dates. FROM ALLEARS:
Beginning at 3 a.m. Eastern time on February 23, Disney's reservation system will be unavailable until later in the afternoon that day as it undergoes an enhancement that will affect operations. The reservation system update will affect bookings for: Walt Disney World,
Disneyland Resort, Aulani, Disney's Vero Beach Resort, Disney's Hilton Head Island Resort, and the Hotels of the Disneyland Resort. You will not be able to book room-only or vacation-package reservations by phone or online at this time. This includes making new resort reservations, making modifications to existing resort reservations, providing confirmations or making payments. This will also affect reservations for dining, dinner shows, tours, recreation, children's activity centers, and Cirque du Soleil's La Nouba at Walt Disney World, as well as Disney's Online Check-In Service. Note that this enhancement project also will affect systems on February 27 from 4 a.m. to 7 a.m. (Dates and times are subject to change. )