Excellent news about Def Jam!
I'd like to think Leona is in a position where a label would keep her regardless of the money she makes them. I think a lot of people see Leona as a figure head, and someone who is very ethical. Its pretty clear she's become so much more than just her music.
Obviously the label needs her to generate some sort of income, which I'm sure she will, but both Island, and Def Jam seemed very proud to have Leona for being Leona. Whereas Syco and RCA seemed to want her for her voice, and that alone, to print money. It was a shame because they made her seem very one dimensional to the general public.