Did Jacen always know that the girl next to the dark man in his vision was his daughter (who was not even born yet)? I don't remember that being revealed as his motivation until this book. Also, I always thought Jacen had thought the dark man was Luke gone Dark Side, and that's what he had been trying to prevent all along. Not that I dislike his motivations for saving his daughter and preventing her from following the dark man (which, come on, we all know is A'Sharad Hett), I just wish this had been in place and/or clearer from the beginning.
Another thought: did Allana remind anyone else a bit of Arya from GRRM's ASoIaF?