Dan,
There should be some new items opened in the Fantasyland expansion by the time you visit. Your best bet is to check the
Disney Parks Blog regularly, as they are likely to have the most up to date announcements.
But to your question, there are a few changes already in place. The move of the
Dumbo attraction, along with the addition of another ride vehicle, is complete. The
Barnstormer is re-opened, also in the Storybook Circus section of that land. Finally, they have added a splash play area, which is great for younger children.
As for openings between now and your trip, it is likely that the new restaurant,
Be Our Guest, should be open. That would mean you have new options for quick service meals at lunch and table service meals at dinner. Dinner reservations should be opening up in late August for the holiday season.
Gaston's Tavern, a quick service option, should also be open.
With attractions, it is projected that both
Under the Sea ~ Journey of The Little Mermaid,
Enchanted Tales with Belle, and
Ariel's Grotto should also be open. So that means a great family-friendly ride, and two character encounters. Both of those meet-and-greets should come with more interactivity and entertainment than the old "wait in line, get an autograph" experiences of old.
As with all things, this is not official, but seems very likely by mid-December.
Have a magical vacation!