Apparently, PokéAni says there's going to be a Pokémon Mystery Dungeon: Explorers of the Sky anime special on April 12th starring Grovyle and Dusknoir.
http://pokeani.com/news/2009_03/0903_pokenews14.html
It appears the special is written by [bp=Category:Episodes written by Aya Matsui]松井亜弥 Aya Matsui[/bp], who also wrote the first two Mystery Dungeon specials.
