What does the author say Chapter 42 is going to be about? Does it give a preview of the topics?

Yes, the beginning of Chapter 42 explicitly sets the stage for its contents. After offering salutations and briefly recapping the previous chapter's stories about Sai's portrait being protected from water and a devotee receiving dream guidance, the author states the chapter's purpose. As mentioned in the text, the author intends to describe Sai's nature, specifically pondering whether his mind was 'intense or soft.' Most importantly, the chapter promises to provide an attentive account of Baba's leaving his body, or his Mahasamadhi. This preview serves to transition the reader from past miracles to the profound event of Baba's final moments on earth.