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There was a discussion on the pros and cons of Z-levels at https://www.kickstarter.com/projects/rocketjumptechnology/king-under-the-mountai... and a conclusion at https://www.kickstarter.com/projects/rocketjumptechnology/king-under-the-mountai...

In short, sadly no, though there'll still be mechanics about digging too greedily and too deep!