I'm really excited for the Superman/Batman book. I mentioned a while back that I'd love a New 52 Superman/Batman book and now we're getting one, and from the interview that Pak did with Newsarama last week...it sounds like he has interesting stuff planned.
Now that Batman is a little more interested in family and teamwork and Superman is a little more insecure, I really think that the groundwork has been laid out for them to actually become close friends in the New 52. It would also be interesting to see if the book addresses the idea that they are both orphans now.
I am not so keen on seeing the action stories in this series but rather the friendship between these two characters. I have only read a couple of issues of World's Finest, but I do like that dynamic that PG and Huntress have.