Earlier today, there were some problems at the facility hosting the servers for Istaria. This resulted in an unexpected outage. From the direction of posts at the community forum, the plan was to perform maintenance on the shards early (including applying the delta that was aborted last week) since they were already down.

As of this posting, it looks like the community site is not reachable after having been back up earlier in the day.

It's a known issue, most definitely unplanned and unexpected. Just another Monday!