Great chapter. Really great, in fact.
For those who were a bit shocked that Palm is already back to her normal stuff, keep in mind that if Togashi decided to use his pacing from the past few sets of 10 chapters, this battle with Palm would take like 5 chapters. Good to see that Togashi wrapped this up quickly. Perhaps he's realized how precious each chapter is, with this whole "break" system.
Loved the emotion in this chapter. Seeing Killua cry is almost as heartbreaking as Gon sobbing.
Seems like Yupi and the King might be able to live. I honestly can't see that Pufu fucker surviving this whole ordeal though; he's just too much trouble. Unsure about Pitou though. While I wouldn't really MIND him living, as long as he just follows the king's orders, it would seem unfitting if Gon didn't murder his ass at the end of this arc.
This chapter did set us up for a lot of upcoming events though, like Knuckle vs. Pufu, Gon vs. Pitou, Gon meeting up with Palm, the two Royal Guards arriving at the battlefield where Meruem and Netero are fighting, and the future of the ants themselves.