Pokemon.com has announced a new Darkrai Wi-Fi distribution to begin taking place May 9th to tie-in with the release of Dark Explorers. Beyond that, no other information was released about its moves.
The most recent Darkrai given out in Japan was for the airliner ANA from late 2010 to early 2011, so it could match that one, as these English events tend to do. That Darkrai came at Level 50 holding an Enigma Berry and knew Dark Void, Ominous Wind, Faint Attack, and Nightmare. Details of the May 9th event should be announced within the next few weeks!