Hmm, there are two official strategy guide for this game:
This one doesn't come out until the 16th

Like what in the burning hell

I will have finished the game thrice by myself by then.
&
Which does come out on the 12th. It's the official Piggyback guide if I'm not mistaken.
Don't know which one to get though. I was leaning towards the first, but it makes no sense to release it 4 days later..