October 16, 2018 is the day Gmorning, Gnight!: Little Pep Talks for Me & You is out! The book comes a week earlier than it was stated when it was announced in three formats: hardcover, ebook and audiobook narrated by Lin-Manuel Miranda himself. Buy the one you prefer on Penguin Random House.
Under the cut you can read the text of the introduction shared by Vulture.