Hotfixed:
Warlock Hotfix - Demonic Sacrifice
This has now been fixed during the restarts this morning. Warlocks using the ability Demonic Sacrifice will once again resurrect with their pet if they die without summoning another pet. (Source)
Hyjal Summit Hotfix - Anetheron
We recently pushed a hotfix through and you should once again get those nice green glowing infernals to deal with. (Source)
Patch 2.4.3 and server instability
Thank you for taking the time to provide us with some positive feedback, Azthoron. The patch did result in some realm instability issues within the first 24 hours, though we really appreciate it when players remain respectful and patient while we work to address such issues.