google hacking book

Hi
I'm getting tempted to buy Johny Long's Google Hacking book but as it
is nearly 3 years old now I was wondering, is it still a useful
reference and are there any signs of a new version coming out in the
near future?

I'm happy to buy the book I just don't want it to fall through the
letterbox only to find out that a new release comes out the next day.

Thanks

Robin

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