Mapcraft has seen little development recently, mostly for three main reasons:
For the latter point, there was a plan to use Mapcraft to generate world maps for large numbers of alien worlds (and work on this did begin, to the point of being able to get images into Celestia). However, Mapcraft has a lot of overhead, and it was very slow and memory hungry. It turned out that such requirements were better served by writing dedicated world mapping software, and this is now part of the WorldGen sub-project.
When I say 'immediate', I mean next. It may be a while before I find time to work on this.
Finish the work to store maps in a database. This should allow much larger maps, possibly with more complexity. It should also allow for a web front end to be added, to allow maps to be searched and browsed dynamically by users.