I really really love the LoL lore and hate how RIOTers are putting it in the least of his worries. Obviously I am totally with the thread's idea ^^
RIOT have already announced that champions are gonna be released in an 3~4 weeks basis. Counting the days to develop a new champion, I think that at least 8 champs are being made simultaneously.
That being said, new champions ideas will take at least 4 months to be concretized, making your wish [Kassadin's daughter being the NEXT released champion] go down the flush.
They already said that there'll be more support champions in 2013. Let's wait and cheer for one of them being Kassadin's girl!
PS: sorry for the bad english, I don't speak english THAT well. Hope u guys understand, anyway.