Some new info and screens on the Octo Expansion, translated from the Japanese Splatoon twitter by Siliconera:
Most of it we already knew, like 80+ levels and your allies being Pearl, Marina, and Cap'n Cuttlefish, but a new tidbit is that if you get stuck you can request help from Pearl and Marina to skip stages. New tracks from Off the Hook will also be featured.
This Octo Expansion looks awesome! So awesome infact it pushes my expectations on what Splatoon 2's lifetime sales just might be.