I'd rather not. First of all, Herobrine was NEVER in the game to begin with. He has always been someone else's creepypasta creation. Besides that, and the fact that Mojang has more or less said Herobrine will never be added to the game. Plus, and this is just my personal opinion, but Herobrine is just kind of a lame character to begin with. It is the same "scary character found in a game" cliche that had been in video games and video game creepypasta for at least a decade before Minecraft was even a thing.
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•Add Herobrine back into the game without telling anyone
People would find Herobrine very, very quickly, so it wouldn't achieve the effect you wanted. Not only do players search for secret changes in every update, but modders would be able to see the code for Herobrine.
While I really like Herobrine, he should be added in a way that isn't just "hey guys he's here now and he's gonna hunt ya down" like in the creepypasta. Make him a new boss in a new dungeon or something.