Here is what i think.
Law is dead, but his soul lives on beause of the ope ope fruit. The only proof I have for that is the last words on the last page. Some voice said: "listen up Straw Hat-ya". Law is the only one who called him like that. His counciusnes must still be present but not in his body. I think this is one of the great powers of Ope-Ope No Mi.
And now he is going to help Luffy defeat Doffy. Or sabo is going to help. Or i don't know i'm still cofused about what's going to hapen.