Windows phone programmers?

Hello guys. I would like to go into window phone programming using c# and XAML.
But the only book I am able to get my hands on is wp7.5 based.
I understand there is a wp8 version but i am unable to acquire it.
My question is, would it benefit much learning wp7.5? Is it out dated? How much different is wp7.5 and wp8?

Do you have any book suggestions?
Or any eBooks you could email me, would be very helpful.

even if wp7.5 is not popular anymore you applications will still work on wp8
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