I like it, but am also cautious via Scott Snyder's tendency to go ultra-esoteric-cosmic and then not really follow up or follow through.
Like two issues from now that character could be totally different is what I mean. I remember it seeming like a huge deal when Sandman was in Darkest Knight: METAL but then nothing really happened with it.
I take Perpetua's words to mean
She'll get offed soon and the rest of her race of beings will become the new big bad, alongside The Darkest Knight