I just received this timely question from Ziggy...
"Do you know if your [XNA] book is still set to be released on the first? I know that in the past Amazon has incorrect dates posted and I do not want to misinform the community."
Ziggyware XNA News and Tutorials
I've been meaning to post a message about this, and it seems that this is the perfect time. although I can't promise that the book will be out on a specific day, it is complete and printed. It should be out any day now :)