Mike Laverick, Ron Olgesby and Scott Herold have been working hard to bring this book out as soon as possible. Although with the fast paced virtualization, you just never know how soon a book can get outdated. Also with VMware's ESX 3.1 and Virtual Center 2.1 in beta, there might be many features, tweaks that may get outdated. Still I am curious to read the book and will buy it when its out.
Here's the link to check out the sample chapters!