The Inkbrush resembles a paint roller, but it's quicker to use. While it doesn't pack a particularly powerful punch, it includes Sprinklers and Inkstrikes to increase coverage.
Earlier this week, Nintendo added a new weapon called the N-Zap '85 to Splatoon for free, along with the Port Mackerel map and Ranked Battle mode. The company is planning to drop additional content for Splatoon all summer long, including a major update in August with a new mode called Rainmaker.
For more on Splatoon, check out our review.