Could you briefly touch upon what changes will there be for Oblivion modders compared to Morrowind?

The editor has received a host of changes ranging from small to large. Many are brand new tools such as the heightfield generation tool, and the region generation tool to populate a large area with objects quickly. The dialogue and quest system has been redone to improve the workflow and tools have been added to better allow Havok objects to be manipulated in the editor. Modders will also have access to the entire range of AI functionality that we have at our disposal.