Well we got the first round of reviews back from the technical reviewers and there’s a lot of work to be done. So much so that we’ve decided to put the book on hold while we regroup and figure out if/how we are going to address the issues that the reviewers found with the book. In a lot of cases it is going to require a complete rewrite of the example (and hence the chapter itself). Personally I feel the core is there, but maybe the examples weren’t as fleshed out as they could have been.
Now of course I’m a little embarrassed that I announced the book before it was done, but that’s what happens sometimes. Not sure at this point whether or not the book will continue, taking some time to regroup/rethink things and see if it is something that I want to push forward with.
I will keep everyone up to date here on the progress of things once I’ve decided what to do. In the meantime I am going to get back to some of my back-burner projects (a few of which have some DSLs in them 
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