The latest scans from CoroCoro revealed the box art for the upcoming games, Pokemon Black 2 and White 2. Also in the images revealed a Keldeo that will be distributed in Japan once you prebook tickets for the movie, Kyruem and The Sacred Swordsman Keldeo. Finally, the Japanese Official Site accidentally revealed an event for Meloetta.
This image shows that the Pokemon will be on the box according to the color of their body, unlike the previous games. White 2 will have White Kyruem with a white background with fire shooting out from the back. Black 2 has Black Kyruem on a black background with lightning shooting from the behind.
This shows an event involving Keldeo. This doesn't tell much as you cannot see the moveset, but it is confirmed that it is Level 15. This Pokemon is available when you preorder the movie tickets for Kyruem and The Sacred Swordsman Keldeo. Tickets will be available for order on April 14 and Keldeo will be up for download on June 23. It will be available for Black, White, Black 2 and White 2
Japan's Official Pokemon site revealed an event for Meloetta. Nothing is known about this event, and more will come.