The overland maps, and any other art type, can be saved as BMP, TGA, PCX, PNG, or JPG. The GIF format isn't supported.
We do a pretty decent job of maintaining backward compatibility with previous releases. So any design you create now should always be usable with future releases. I'm not sure if we will ever reach a state where we consider DC finished. Many people keep us busy with feature requests. Still, once spells are completed I would say that the core of DC is Gold. Magic is the last missing core feature (compared to UA). As things are now, major code changes keep happening to accomodate spell coding.
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CocoaSpud
Dungeon Craft Development Team
http://uaf.sourceforge.net