I don't think Deulofeu will be promoted, though he's obviously way too good for the Segunda. I expect Rafinha and Sergi Roberto to be promoted, however.
As for players leaving, I think we'll sell Fontas, Bojan, Afellay (the obvious ones) plus Villa, Alexis, Dos Santos and maybe Mascherano (if we get a new CB).
What happens with Bartra and Muniesa nobody know, though I don't think Barca will sell them as they are very talented and Bartra has shown on numerous occasions that he's actually ready to play regularly, and I think a loan is also unlikely for both. Montoya will certainly play more often next season, but I think Alves is going to stay here for another season before he leaves.
It looks likely right now that we'll get a new GK, a CB and a winger. Even though we have many talents in these positions (Deulofeu, Tello, Cuenca, Bartra, Muniesa, Ondoa), the board will probably decide that we need some reinforcements now. As long as we don't get 20-year-olds who block our Masia graduates' way or players who cost 50m, I'm fine with that.