It's a mix of current and prequel I believe, in other words while Drizzt and his father met again in the current times, there are flash backs to his father's time with Jarelax (sorry if I misspelled his name, it's been a long hard, day).
Having read the novel it's not a prequel, it has a chapters that focus on the past and chapters that focus on present (sort of events), it's almost like two linked, but separate books in one.