Dane DeHaan has been cast as Harry Osborn in Amazing Spider-Man 2, according to a tweet Monday by director Marc Webb.  After an early career primarily on TV (including three episodes of True Blood), DeHaan drew attention for his role as the lead in Chronicle, released early this year.  He’ll join cast-mates Andrew Garfield, Emma Stone, Jamie Foxx, and others (see "Jamie Foxx in 'Spider-Man 2'"). 
Some storyline details have emerged, including the fact that the story will include the death of Gwen Stacy (see "'Spider-Man' Sequel Built Around the Death of Gwen Stacy").