Here are some of the other posters: UPDATE: Here are the rest of the 26 posters:
Love, Election, and Chocolate
Blue Exorcist (movie in 2012)
Black Rock Shooter
Hotarubi no Mori e
Rurouni Kenshin - New Kyoto Arc
Sword Art Online
The Anime Contents Expo will be held March 31st and April 1st at Makuhari Messe in Chiba. Aniplex is planning plenty of trailer screenings, stage events, art exhibits, and themed food items like a Kyubey drink (available at the food court at the event).