It has already come out.
It's already out.
Rangers Apprentice 11 will come out in 2011 October
It is already out.
October 12 2010
Oct 4th 2011
It will come out on June 15, 2010
Book 6 has already come out.
no book 10, 11, and 12 are yet to come out
Now
2011
I don't know, but you can buy the Australian version of it on Amazon.
It should be ten at the moment although the tenth book hasn't come out in some countries yet.