Welcome to the Disney Parks Moms Panel! I think it's never too early to start planning your Walt Disney World vacation, and January is a great time to visit. Looking at when rates have been released in the past, my best guess is that 2015 information will be released around July 2014. Although this isn't a guarantee, it does give you an idea of when you'll be able to start comparing rates for different resorts and packages online. However, that doesn't mean you can't get something reserved now. You can always make room-only reservations up to 499 days before your check-out date by calling the reservation line at (407) W-DISNEY (934-7639). Rates won't yet be guaranteed, but you'll have the peace of mind of knowing you have exactly the room you want for your vacation dates.
Wishing you magical vacation planning!