What was Kripke's plan?

Does anybody know some ideas that Eric had for Supernatural and decided to change them for this au that reason?

For example, I know that Anna was supposed to do some things that Cas did cause the mashabiki liked Cas better then her.

Jessica was supposed to be evil au possesed.
The onyesha was supposed to be about a journalist.
John was supposed to appear in DALDOM insted of Lisa etc.

Do wewe know anymore interesting stuff like that? Does anybody know the plans for Bela au Jo (if it wasn't for the shabiki hate)? How season 5 was supposed to end?

Thanks!