With tickets for Star Wars celebration Anaheim starting to sell on the 7th at 7am, I'm only guessing there will be no D23Expo in Anaheim that year. Buying tickets 2 years in advance for Star Wars Celebration seems crazy though. But being so close to Hollywood and a gas tank from Lucasfilm, there should be a lot of cast, crew and props there from episode 7.
I went to the big Star Wars convention nearby in LA held in '87 when Star Tours opened and Disney had a good presence there. Hopefully Disney will be there in 2015 talking about a Disneyland Resort Star Wars mini land or Tomorrowland Overlay.