The official Madoka Magica site has posted a listing of special goods that will be available at Japanese screenings of the movies. Perhaps coolest of these is a stuffed Kyubey whose long ears double as a scarf. There's also soul gem, witch and QB earphone jack plugs and more.
Puella Magi Madoka Magica the Movie Part I: The Beginning Story brochure - 900yen ($11.50)
Puella Magi Madoka Magica the Movie Part II: The Eternal Story - 900yen ($11.50)
B1 tapestry - 4,000yen ($52)
stuff Kyubey scard 2500yen ($32)
Plush keychain dolls 1500yen ($19)
Ear phone jack plug 800yen each ($10.20)
Items were on display at the Kyoto International Manga Anime Fair
Aniplex has announced that special goods will be available at the LA screen of the movie, but it is unclear whether that will include these items.