It's finally been released......what happened to Tony Soprano at the end of the show? FINALLY producer David Chase answered on VOX:

Okay, here goes: Is Tony dead or what?

We were in a tiny coffee shop, when, in the middle of a low-key chat about a writing problem I was having, I popped the question. Chase startled me by turning toward me and saying with sudden, explosive anger, “Why are we talking about this?” I answered, “I’m just curious.” And then, for whatever reason, he told me. [...] He shook his head “no.” And he said simply, “No he isn’t.”