eideard wrote: And if you're in the southern US you'll also hear "A 'm good."

Nonsense. I've lived in the South for over 20 years, and I've never hear anyone say that. Southern Americans say "
I'm good," as well as "I'm fine" (which is more common) and "I'm doing good/well/fine," usually followed by "thanks" or "thank you" because Southerners still value politeness as well as forming complete sentences. (A side note: While some wanna-be grammaticians might quibble over whether "I'm good" is "proper" English, actually it's prefectly fine, seeing in colloquial American English, one says "I'm well" to refer more specifically to one's present state of physical health. "I'm good/fine" or "I'm doing well/good/fine" are used more to express mood, mental/emotional state, or state of personal circumstances.)
Sorry, but while I'm not a native Southerner, I've come to have a lot of respect for them and for how well they have preserved "good" English in their colloquial speech, despite the common stereotypes about them or how other people consciously or unconsciously "mishear" Southerners due to their own personal biases.
Back to the topic: while it's great they're coming out (eventually) with a new learner's book, what I would really like to see is more intermediate materials available.