I mostly agree with the two decks proposed up until now.
Is WTFbow against earth a bad idea? It doesn't care for most they've used last round, it just deals lots of damage fast.
For some reason, I expect Darkness to use either their nova deck (or the anti-pande one, possibly.)
At this point, aether can and will expect our Void deck vs them, expecially because hain almost lost to it already. I wouldn't be surprised if they went fractix for real or with the novabow. I wouldn't use sopa because I expect either a lot of PC or a lot of PUs. Actually, possibly a novabow with a single purify in, so poison isn't a choice either. Perhaps, the SoPaDevs trident deck could work, but I don't see this as a clear matchup.