Not new weapons, but close enough.
Edit: The balance update will release on March 8 with the two weapon combination updates starting in April.
Splatoon is getting a two-part update offering new weapon combinations and balances to gameplay and matchmaking starting in April, today's Direct revealed.
Weapons, sub-weapons, and abilities that are underused by the community are being strengthened, then offered in new combinations to encourage more variety.
Volume 1 should release in April, with Volume 2 release sometime in the future. The combinations are "hand-picked" by Sheldon, the in-game weapons seller.