Just taking a quick glance through the table of contents, it looks like it aims to focus more on "how to think about problems in this paradigm" (as the title implies) than the more practically-oriented "let's go write fizz-buzz" approach. For example, it jumps into function composition before it even talks about how to use GHCi. It has a chapter called "Proofs", and it seems to have a chapter focusing on using lazy evaluation to trade off time and space consumption.

Glancing at the text available, it doesn't seem to make any references to other programming languages, and takes an approach of "let's build this up from the things you learned in Math class". Seems like it might be a good fit for someone with more math than programming background, or someone with enough programming experience that they want to get to the heart of what functional programming is, but a bit jaded by the usual language tutorial format.