Directly to you from Twitter:
The #ARMS Ver. 5.0 update is now available to download!— Nintendo Versus (@NintendoVS) December 22, 2017
・New fighter Dr. Coyle joins the fight!
・New ARMS have been added!
・New stage [NAME REDACTED] has been added!
View full patch notes: https://t.co/s0vedUyadQ pic.twitter.com/SzMroteAB0
…Wanna play? Buy a Switch.
And if you’ve already got yours, click on Arms for everything you need to know about the game. 😀