Another movie is in the works, which explains the beginning of the Adregalus story. "Adregalus Chapter 0: Heritage" should be out by the 1st of March 2008. (give or take a few weeks)

http://www.adregalus.net/heritage

After that, it's.. "Drakojan Skies: Liberation".
More info on that, here: http://www.adregalus.net/drakojanskies /