The team is working to bring Nui back online. We'll post regular updates here with our progress.
We are aware of the arena problems on Aria and Kadum. We are investigating and will keep you updated in this post.
We are aware that Nui is showing under maintenance currently, and are working to bring it back up as quickly as possible. We'll provide updates here with any additional information when we have it.
We are aware of latency issues and delays with skills players experienced during the new Golden Plains Battle arena last night on EU, and expect to see similar issues during the battle on NA this evening. The team is actively troubleshooting, and are in the process of testing and adding additional hardware to assist with this.
We appreciate your patience with this issue, and will provide additional updates as we can.