No really, stop it with the Appendices. Please. There's certainly not "plenty of material" to find there. Just a quick recap:
deals with the fall of Numenor, the history of Arnor, Gondor and Rohan, and the tale of Aragorn and Arwen. Not much here that could be used in The Hobbit.
is a short chronology. That's what Peter Jackson is likely to use to expand his story, but again, there's not much there that ties directly to the narrative. The only elements which could be used deal with the Necromancer, Dol Guldur, the Gladden Fields and Thrain.
is a list of hobbit family trees. Nothing to use there.
is about different Middle Earth calendars. Nothing to use there.
is basically Tolkien's notes on writing and spelling. Nothing to use there.
deals with languages and translation. Nothing to use there.
In addition to that, I guess Peter Jackson could use the material he hasn't used for his Lord of the Rings movies: Tom Bombadil, the Barrow-Downs and the Scouring of the Shire.