It seems that Dark Eldar our next up after a three-week fantasy release. Rumors have it that all 40 K soft cover Codices are a priority for GW to replace.
What this means for a Dark Eldar release, I don't know. From the Grey Knight release, I would expect the Dark Eldar releases to be quick and brief.
via Steve the Warboss on Faeit 212
Fantasy 3-Week-Releases. After this Dark Eldar.