It’s too soon to get a physical copy of Church Inside Out, but you can already start reading. 21st Century Christian has posted sample pages of both the book and the workbook.

You can find the book sample here: https://www.21stcc.com/pdfs/samplepages/9780890989159.pdf

You can find the workbook sample here: https://www.21stcc.com/pdfs/samplepages/9780890989166.pdf