So, nuJohnLocke = guy in black on the beach = Jacob's nemesis = black cloud. All one in the same...
There was also the wall carving
of Anubis, god of the underworld (death) facing the smoke monster next to a symbol of the inverted ankh in the temple passages from last season. Perhaps Smokey is either the instrument of Anubis or Anubis incarnate.
Then we have the statue of Taweret, the Egyptian goddess of childbirth and fertility (holding the Ankh, and the obvious ties to childbirth, rebirth and healing powers of the island), possibly represented by Jacob, despite the gender difference. He definitely seems less aggressive than his counterpart on the island, but both clearly ancient. I'm curious how Richard ties in with all this. He's pretty old too but doesn't seem to be as powerful. He likely represents the balance between the two entities, but unclear as to deeper purpose.
Definitely seems to be some yin/yang stuff going on here, as Anubis' mission seems to be diametrically opposed to Taweret's mission. Jacob's death likely throws off this balance, although it isn't clear in which direction. His death might have made him more powerful and free to influence the mortals of the island, Obi-wan style, unbeknown to black-shirt guy, who probably believes he's "won" via the "loophole". I like where this is going.