I'm not even happy about it. I would prefer to keep these franchises seperate until Bats is rebooted on his own for a movie and we saw the fallout from the first MOS in his own sequel, but I'm just being realistic. Compared to the 3 Nolan Bat movies, Superman didn't quite stack up. I don't see them now alienating Batman fans and all their money by having this new rookie Superman beat him mercilessly.
I [and many others] won't be too pleased to have our sense of logic insulted by the idea of a mere human "mercilessly beating" a guy who has the power to literally push planets out of their orbits. And who throws locomotives.
If they're just going to get all stupid with this premise, I will totally lose interest. And all these issues yet again point out WHY MERGING THESE FRANCHISES IS A HORRIBLE IDEA.