Snyder didn't actually refer to Batman by name at all. The press release said they have yet to cast the new Batman. There's no information beyond that so far.
I wasn't there, but this is what I read:
Zack Snyder, who made a surprise appearance at Comic-Con today, breaking the news to audiences there, later said, “I’m so excited to begin working again with Henry Cavill in the world we created, and I can’t wait to expand the DC Universe in this next chapter. Let’s face it, it’s beyond mythological to have Superman and our new Batman facing off, since they are the greatest Super Heroes in the world.”
http://batman-news.com/2013/07/20/warner-bros-announces-batman-superman-movie-for-2015/