I'm not sure Gigi will die: such ending of the Faith arc would be too grim and devoid of hope. I'd rather see her alive and unrepentant - but starting to grow up. As to Faith... I'd love to see her spinoff. With guest spots on Angel: After the Fall.

I believe that twilight is more or less opposite of dawn. Twilight happens at sunset, dawn - at sunrise. I wonder if these opposing names could play some role in the story. After all, Dawn's still a key. I read post-Chosen fanfics in whish she uses her "keyness" to open portals and save the day.