User blog comment:San&Ashitaka/Chapter 52 Predictions/Expectations/@comment-206.24.49.1-20131213052300/@comment-179280-20131213062509

There are answers for some of those:

2.- They are in Shiganshina. That's what Volume 12 showed.

4.- When she actually knows something. She does not know anything regarding the Walls.

6.- They can't go during the day, because Titans will attack them, and they can't go at night because they won't see crap. So, they'll probably go when Eren is capable of controlling Titans consciously.

7.- Maybe because he's the responsible behind all the conspiracy happenning/building the Walls using Titans.

8.- Because they were sent to search for the Coordinate, and in case they didn't find it, they would have destroyed the remaining Walls anyways. And why they were sent as children? Probably because children are easy to manipulate (and they were 4 originally, but one was eaten by Ymir).