Darby McDevitt mentioned in a statement with Ubisoft Blog that Edward (AS4) is almost a counterpoint to Connor (AS3) some ways.
Explaining his lines he said that Connor begins very idealistic and the experience he has got through Assassin’s Creed 3 starts to make him feel very tired but he was still continuing with it according to him it was the right choice .
The reason which makes him so hooked up with piracy was to get back the lost love and affection from his wife.
EXPECTED RELEASE- Assassin’s Creed 4: Black Flag is due on PlayStation 3, Wii U and Xbox 360 at the end of October and early November, and will be out for PC, PlayStation 4 and Xbox One release soon after that.