'Lost' Supper? What Does These Promo Photos Mean?

Stumbled across a new Lost promotional image on Pop Candy this morning with the cast of Lost posed to resemble Jesus and his disciples in Da Vinci's famous painting, The Last Supper.

While I was trying to absorb the imagery (ruins of a Dharma building, gun under the table, a skull . . . maybe? Is that supposed to be a cross over Jack Shephard's left shoulder?), I saw the twin promo photo, where the castmates are all looking at the dead-not-dead "Locke," with a few of the people sitting in different places (Claire, Sun, Jin and Miles).

The New York Times' TV blogger Dave Itzkoff points out that in both images Sayid is standing where Judas stood (I would've thought Ben Linus would've been put in this position) and that Locke is smiling in the image when everyone's looking at him but not in the one where everyone's looking straight ahead.

What does this Locke-as-Jesus photo mean with the Losties sitting behind a table fashioned out of an airplane wing?

Image credit: ABC via Pop Candy and via the New York Times.