Bleeding Cool says that it's Dick Grayson as Batman, so Wonder Woman might be Donna. In that case, Superman might be Clark Kent, Jr.Covers revealed for the Earth 2 books.
http://www.newsarama.com/comics/dc-earth-2-variant-cover-120210.html
I kind of like the Batman, Superman, Wonder Woman one. I thought the whole point of this other book was to showcase the Justice Society?

. I Can't wait to see what's different and what's the same.
I'm familiar with the big three's history with the JSA but yeah for a variant cover to feature them is an interesting choice.