At this point, from what I know the lines might be slightly different, but when it comes to how many of them, what exactly will be different - it's a bit too early to say.Will there be different quests/dialogue depending on if you play the female or male version of V?
Clearly the voice actor must be different , but I doubt quests and characters will react the exact same way depending on if you play the female or male version. Will the dialogue lines really be the same but with just a different voice actor?
At the same time, it would be way too much work to make 2 entirely different games for the male/female V, so some compromise has to be made?