ARMS has been getting a steady stream of new content ever since the game was released earlier this year. This trend has continued with a new update that puts the game at version 4.1. Although we have no patch notes, we do know that the update adds a playable Springton, some new badges and many balance changes. The news comes from a Japanese tweet made by Nintendo, so we’ve included the tweet down below.
新・格闘スポーツ『ARMS』、Ver.4.1 配信開始!
・謎の新ファイター「スプリングトロン」が使用可能に!
・バッジ追加!
・その他バランス調整ぜひアップデートして遊んでみてください!https://t.co/tqV3sQqbUh pic.twitter.com/31kUQeCrdm
— ARMS(アームズ) (@ARMS_Cobutter) November 30, 2017

Called it!
Springton is a new playable character now?! Awesome! Booting this up when I get home from work, for sure.