The web is full of theories.
Everyone has their own.
A Reuter's article today has some very interesting info!
"In the final moments of Sunday's concluding episode, Tony, the conflicted mob boss who has just survived a round of gangland warfare, sits in a diner with his family munching on onion rings as the 1980s song by rock band Journey, "Don't Stop Believing," blares from a juke box....The biggest hint, according to a consensus taking shape on the Web, is a scene from an earlier episode in which Tony and his brother-in-law, Bobby Bacala, muse about what it feels like to die. "At the end, you probably don't hear anything, everything just goes black," Bobby says while they sit fishing in a small boat on a lake. That scene is recalled briefly in a flashback played at the end of the penultimate "Sopranos" episode, as Tony is lying in the darkened room of a safehouse clutching a machine gun to his chest in the midst of a mob war."
What do you think?