"Appear Offline" coming soon
Hiding from people on your friend list will soon be made available Battle.net, Diablo III to receive it the soonest.
The "appear offline" mode is scheduled to hit the inhabitants of Sanctuary with a patch soon after 1.0.5 but StarCraft II and World of WarCraft players will have to wait for Heart of the Swarm/Mists of Pandaria to be released first.
The “Appear Offline” status option will be added to World of Warcraft, StarCraft II, and Diablo III separately in future updates for each game. For Diablo III, we expect to add the feature in a patch after 1.0.5. For World of Warcraft and StarCraft II, we expect to add the option sometime after the release of each game’s upcoming expansion.
Thanks for your continued feedback, and we’ll share more information on the availability of this new feature in the months ahead.