Wonder Woman rumored to be Kryptonian offshoot.

[Hand of Evil]

But Batman vs. Superman is Superman 2.

Do we know how much Batman is going to be in Superman 2, I mean it could be a 5 minute cameo at the end as a promo for the next movie.

 

[Kramodlog]

We do not know. They made a big fuss about it, so it should be more important than a cameo. I think it will be a bait and switch. Start with a Batman Superman conflict to have them team up against a vilain. If the vilain is Luthor, having billionaire Bruce Wayne interact with billionaire Lex Luthor would make sense. I guess Luthor could have a Dragon, some sort of beefed up vilain who will fight Superman. The Rock would make sense here.

 

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turns out it's not true http://www.newsarama.com/19980-wonder-woman-is-kryptonian-non-rumor-inspires-internet-frenzy.html