Gwenyvere will hatch in the Manhattan Clan's rookery in 2038.  Though the clan may or may not be aware of it, she is the biological daughter, and middle child, of Broadway and Angela, and biological sister to Artus and Lancelot. Little else is known of her.
Real World Background
Gwenyvere was named, more or less, after Queen Guinevere, King Arthur Pendragon's wife. This, combined with the names of Arthur and Lancelot, suggests that King Arthur will have some great significance for the Manhattan Clan or some of its members.