No word of a U.S. distribution as of yet, but they'll probably be distributed around the time the 12th movie gets dubbed and released.
The Jirachi was distributed from June 19 to July 17 by Japanese McDonald's, the Nintendo Zone in Japan, and via Wi-Fi for Japanese Pokemon games. It's known as the Nintendo Zone or Tanabata Jirachi (Tanabata, a star festival that takes place in Japan on July 7th). It's lv. 5, in a Cherish Ball, holding a Leichi Berry its ID no. is 06199 (06/19/09), its OT is NZ, it's has a classic ribbon (which means no GTS), its nature is random, and it knows Wish, Rest, Confusion, and Draco Meteor.
The Arceus is distributed when while the movie is playing in Japan. It's lv. 100, in a cherish ball, Rowap Berry, random nature, OT is Eigakan, ID no. is 07189 (07/18/09; movie debut), classic ribbon, and knows Judgement, Roar of Time, Spacial Rend, and Shadow Force.
Event exclusives in bold.