74 weapons covering every playstyle.
http://www.nintendoworldreport.com/news/41787/last-free-splatoon-weapon-announced
Tomorrow night's Splatoon update will feature the last free weapon update for the game.
The 74th and last free weapon (not counting those unlocked in the amiibo challenges) is the Custom Hydra Splatling, which is known for its abilities at long range. It has a Sprinkler subweapon and a Bubbler special.
With one stage left to release, it appears as though the free updates will come to an end around January 22.