May or may not do it again.
Blizzard announced this week that it is rolling back hardcore realms following an “unprecedented distributed-denial-of-service attack” that knocked out services for players and caused mass-death in the hardcore realms. Due to the widespread nature of the most recent DDoS attacks, the company is going to restore characters who died during it.
The post goes on to state that while this is a new policy, Blizzard’s stance as a whole on resurrecting hardcore characters due to server problems has not changed. This will only be used during times when the DDoS attacks are considered impactful enough.
In the future, Blizzard may elect – at our sole discretion – to revive Hardcore characters that perish in a mass event which we deem inconsistent with the integrity of the game, such as a DDoS attack.
Our broader stance on character restorations or death appeals has not changed. To be clear, we do not intend to revive characters which have died due to server disconnects, lag spikes, gameplay bugs, or any other reasons. Blizzard Customer Support cannot assist with issues related to characters who have died on Hardcore realms.
The announcement has garnered some negative reactions from players due to perceived favoritism toward a rather large guild that was affected, and apparently targeted, by the DDoS attacks.