The NA region shards will be coming down for a brief update - sans additional server maintenance! - at 8:00am pdt tomorrow, 7/19/12. This is going to be hotfix 8.5, which includes the additional changes that went to EU shards on the evening of 7/18/12 PDT time. Estimated downtime is **30 minutes **.
Patch notes will be updated!
I'll be back in the morning with status updates during the downtime.