That's just a plot point to set up Sansa's "adventure" in the Kings Landing-centric Feast For Crows. Personally, I didn't like the 4th book (few did as the better characters didn't even appear), but I have high hopes for the next one to be released this July. That one's going to be a dandy, as the dragon's ascent is sure to cross paths with the Lord Commander and Champion of the Night's Watch - the two REAL stars of the series, in my opinion. At least, I hope their paths will finally cross at this point of the new age.
But, are we allowed to discuss spoilers here? I hope so, because this thread is about the books and not the TV series, right? And there are a lot of things - both settled and unsettled - that this planned sextet leaves for intelligent conversations.
If spoilers are allowed, perhaps we can edit the title so that the members who want to experience and enjoy the series in their own pace and time would be warned to stay away. God knows how spoilers can ruin one's experience, and we wouldn't want that to happen.