For the players who have walked away completely from ARMS, in favour of Splatoon, next week we’ll have a reason to go back to it!
According to the official Twitter account for ARMS, the new teased update will arrive sometime in the middle of the week. Other than more balancing, not much has been said about what the update will entail, but we have been asked to stay tuned as more information is coming.
— ARMS（アームズ） (@ARMS_Cobutter) August 4, 2017
Just as soon as there is more to share, share it we shall, but if none comes, the update will release next week and we can all find out then.
Source: @ARMS_Cobutter (Twitter)