You are absolutely right about that. Both the Mule in Action as the Mule 2 book from Apress will cover more Mule features. But I think the Mule in Action book will cover Mule 2 in more detail when I look at the number of pages of the Apress book (160 pages).
Vineet Khilani wrote:
"Open Source ESBs in action" is a good book to get you started with Mule but it is not a complete reference for all Mule features. I am looking forward to the Mule-2 book from Apress hoping it will cover advanced topics.