I haven't had a lot of free time to work on this thing this month, but cave maps are almost ready. They just have a few little graphical issues to work out. If I don't get them ironed out in the next couple days I'll probably just release it and fix them later under a v0.51 -- they shouldn't negatively affect anything, it will just look a little weird here and there.
One thing I'd sort of like to work on next is a Mana Fort Interior map type. It's so colorful and flashy.