The tutorial/introductory map (Proving Stones) is structurally complete, and I'm planning on putting it up alongside Monolith shortly after the release of 1.8. If there a major want for it beforehand however, I'll consider taking a break from Monolith and just finish it early on a snapshot.
The 5 main maps' difficulties are generally planned to ramp up, but that doesn't mean the first one will be easy. As said, it'll be about on par with an average CTM map.
Current Completion Update:
Monolith: 53% Complete (+6% from 47%)
Quote from soupbob
have you been working on these maps in secret since zm was scrapped?
Nope, just started a couple weeks into summer.
Quote from Zap_12100
Some hardcore stuff you've got going on here
Hah, yeah, probably a little excessive, so far I've just used it for making the head statues. Might find another use later...
Speaking of Proving Stones, here's a peek: