Mostly filler, but it's the good kind of filler. We're wrapping up old plots and setting the stage for new ones. More to the point, the core of Saga remains what it has always been: a story about an unconventional family trying to find their place. 
 It's not all fluff. We get a fair amount of character death/incapacitation here, as well as the ongoing fallout from the death of Marko's father. The only downside to a 'filler' type volume is that there's not a lot to really sink your teeth into.