The Direct confirmed that Splatoon 3 will have DLC, with the likely involvement of Pearl and Marina.
While the DLC could introduce a new playable species, I don't think that's likely, despite Splatoon 2's Octo Expansion introducing playable Octolings. However, I do think it will have a conclusive story kind-of deal if the Splatoon 3's base story mode doesn't conclude it first. It will also be teased much like how Splatoon 2's base story mode teased Octo Expansion.
So, what could its story be? At the moment, it's unknown, but its completion and possible new gameplay will forever change the lobby. So, if Splatoon 3 doesn't conclude the Octarian arc, then the DLC likely will.
The story could be a new mission for New Agent 3, this time involving Pearl, Marina, Agent 4, and Agent 8. And just like before, both Agent 4 and Agent 8 are customizable before they make an actual appearance, being limited to Splatoon 2's customization.
While the DLC could introduce a new playable species, I don't think that's likely, despite Splatoon 2's Octo Expansion introducing playable Octolings. However, I do think it will have a conclusive story kind-of deal if the Splatoon 3's base story mode doesn't conclude it first. It will also be teased much like how Splatoon 2's base story mode teased Octo Expansion.
So, what could its story be? At the moment, it's unknown, but its completion and possible new gameplay will forever change the lobby. So, if Splatoon 3 doesn't conclude the Octarian arc, then the DLC likely will.
The story could be a new mission for New Agent 3, this time involving Pearl, Marina, Agent 4, and Agent 8. And just like before, both Agent 4 and Agent 8 are customizable before they make an actual appearance, being limited to Splatoon 2's customization.