The NA region shards will be coming down to receive 1.4.1 hotfix #4 tomorrow morning at 8:00am PDT [8/9/11]. The estimated downtime is ** 30 minutes **.
Patch notes will be updated on the patcher and are currently posted in the Patch Notes forum.
I’ll be back in the morning with status updates during the downtime, here on the Community blog!
EDIT: 8:00am PDT: The NA region shards are coming down for this update now!
EDIT: 8:20am PDT: NA region shards are unlocking now. (had a blog blip this morning!)