Well, while we're talking about the general lack of angstiness in the series so far, there is something in one of the trailers that seems to be the first big turning point as far as an inner conflict goes (Of course, this is mostly speculation, and a lot of it could be wrong). In one clip, it shows four captured benders on some sort of trial by the anti-benders. I dont know if anyone else here noticed, but Bolin is one of the prisoners (The one to the far right, I think). In another part, it shows Bolin being electrocuted by one of the anti-bender soldiers.
Obviously, this means that something terrible is going to happen to him, or at the very least make the anti-benders directly associated with just about the only thing that has caused her to really fear losing someone, or having any real cause for worry at all. This could cause her to have a very different struggle from Aang, who always had something to worry about, and therefore be a little more used to having to deal with such large amounts of stress.