Fowler working on a dsl book

I just found out that Martin Fowler is working on a dsl book.
(Hopefully Martin will give a presentation on the codegeneration conference next year).

It is still a work in progress. You can find more information over here.

What I understand is that it will be more of a general approach in a "duplex" form.

I am looking forward too read it and hopefully I learn something of it, like all his previous books I bought.