Alice in Wonderland sequel had been presented at D23 Expo as well. It has been given a subtitle of Through the Looking Glass. Disney compared to other movies were more prepared for presenting Alice in Wonderland because they even had the ready full trailer to share.
Based on the descriptions of people who witnessed the trailer it's basically a time travel movie. Alice goes to underworld again but this time for saving Mad Hatter played by Johnny Depp, who is going madder and madder as time passes, without anybody knowing the reasons for such behaviour. Therefore Alice decides to travel back in time through the looking glass and figure out what had happened to Mad Hatter in the past.
2 cool looking posters were also released. Movie is set to hit theatres on May 27 2016.