In a new MySpace blog entry, KNB EFX guru Howard Berger mentions that work on Prince Caspian is now complete and he will be taking a short break before beginning work on The Voyage of the Dawn Treader. Filming on Dawn Treader will begin in late January. First up in the locations this time will be the island nation of Malta, as expected, followed by Prague and Iceland. Previous reports suggested that filming in Antarctica might be on the cards, but it now seems that Iceland will be used instead.
My source (the same source for the report linked to above regarding Antarctica shoots) had informed me that Malta was already heavily being considered, as well as various other islands in the South Pacific. This is likely because the island is home to C.S. Lewis's stepson Douglas Gresham.
Because of the opportunities diverse climates and surroundings for the different islands (Deathwater and Dragon Island being indicated as being rather of a rain forest climate, while Dufflepud Island is more of a coastal English countryside), there will no doubt be diverse locations used to bring all of the different islands to the screen.
Notably, the film will be returning to Barrandov Studio, which the local economy will no doubt appreciate; according to the Czech Business Weekly, the local film economy has been struggling.