Last year, the text went to great lengths to explain how you make the structure of new grammatical patterns, often using (confusing, ridiculous) new English-language terms to describe it.
This new text cares less about how to make it yourself, almost assuming you can do that from the info it gives. It instead says, "When you see this (example grammatical pattern), what it's saying is this (English equivalent and needed explanations)." It then gives examples.
When actually getting down to STUDY the stuff, format two makes a hell of a lot more sense.