Sadly, I think that Harry may die in the new book. There was talk at a few interviews in which J.K. Rowling stated that she was thinking of it, to properly end the series. I hope that doesn’t happen though.
I do think that Sirius will come back, he just disapeared after all and they said he wouldn’t be able to come back, but come on! He’s the first person to ever escape azkaban!! He’ll come back.
I’m so excited I can’t wait! Only one more day!