SkyClan

SkyClan has appeared in every single Warrior Cats arc, except for the first one. That leads readers to wonder if they will be featured in any way in the fifth arc. As Erin told us, the fifth arc will go back to the beginning of the clans, so my guess is yes, they will probably be in all six books of the new arc. We might even get to see the forest map with the SkyClan borders included! SkyClan's old territory might be somewhere within these red lines, it is one of the higher tree-populated areas.

Nothing has been confirmed by yet by Erin though!