From the Disney Dateline Newsletter:
Walt Disney World Dining Reservations Now Online, with Booking Window Expanding to 180 Days on Oct. 27
LAKE BUENA VISTA, Fla. – With a new online dining reservations system, guests can now book most Walt Disney World table-service restaurants at Walt Disney World Resort. And beginning Oct. 27, the booking window increases to 180 days in advance (up from 90 days).
Reservations can be made for up to 10 guests (more than 10 requires a call to Disney Dining Reservations). The only restaurant that cannot be booked online is Victoria & Albert’s (special dining currently is not included – such as Fantasmic! Dinner Package, My Perfectly Princess Tea Party, Jiko Dinner Series, Wanyama Safari Resort Tour and the Sweetheart Dinner for Two).
Guests also can cancel reservations online if no payment has been made. For booking by phone, call 407/WDW-DINE.