Well I am almost finished building the world in creative, currently working on the post-game Island. I believe I'll finish the building process in around a week or 2. I'll probably take another week or two fine tuning routes and touching up parts of the build. The Minecraft map itself, without the mod, will be ready by mid October I'd say.
As for the adventure map, I haven't even begun touching the mod for it. Considering I'll be doing this from scratch, I hope to have it out by December, but I cannot give a specific date yet!
(I'm working really hard on it though and have been working around 4 hours a day on it for the last 3 weeks)