Drysc offered a bit of info about Starcraft WorldEdit and alerts further details will be made available soon.

Drysc: “StarCraft IIs editor features a proprietary scripting language that is based largely on C with some special parameters specific to the game. Of course, for most users, they will have access to the more user friendly Trigger Editor which will allow beginner and intermediate map designers to make advanced maps without having to learn the particular details of the scripting language. We’ll release further information about the world editor as we move forward.”