SNK has revealed on twitter that a patch for the online issues for King of Fighters XIV is in review and may launch in a few days. You can see the tweet below.
NOTICE: Patch fixing issues in online mode is currently in-review. A few days may be required until its approval / launch. #KOF14 #KOFXIV
— SNK GLOBAL (@SNKPofficial) August 26, 2016
In the meantime, you can check out our review of the game here.