Eric Lefevre-Ardant has an excellent transcript of a discussion about Fit that I participated in on Twitter a few weeks ago. Here's an excerpt:
Michael Feathers replied that, in his view, Fit was more appropriate as a seed for other works: “Take it, grow it locally, and never commit back.” This seems confirmed by James Shore, a former leader of the Fit project (and a successor to Ward in that role): “Fit core was intentionally resistant to change [...] from an organizational perspective”
Interestingly, James believes that both Fit and Fitnesse have “similar flaws, which could be solved by another approach”:
If you're interested in Fit, FitNesse, or similar tools, it's well worth the read.