[Possible Unintentional Spoilers] Speculations of the Next Story Arc?

So, if you guys are far enough in the story of the new map Menon. We all know the connection of summoning and Karna Masta. The possibility of the consequences of killing him. Along with the next story arc to be a work in progress. What are your thoughts about the upcoming arc? Do you think summoning will be restricted? Only able to use story units in a squad? Ark's role in it? Or something more? Will we actually get to see our good ol' Summoner-kun's face? I'm open to all your thoughts.

~"Keep on fighting Summoners, the future is still being determined by you."