I know that you are anxious for this book to be out since TMG 2010 is already a reality today, I am too. The good news is that it is close, next month it will be available as announced this week on MS Press Blog. While you are waiting for this book to come out, we got a pretty cool preview for you, two full chapters so you can read it and get the feeling of the core book writing style. Besides those two sample chapters, here it is the final and full open cover for the book:
Access http://blogs.msdn.com/microsoft_press/archive/2010/01/13/forefront-tmg-2010-administrator-s-companion-sample-chapters.aspx for more details about the sample chapters and how to download it.