Just passing along some information I read in the steel book portion of the Blu-Ray.com forum.
The BB Steel book of BvS is only ONE steel book. It was marketed as two separate covers, a Batman or a Superman cover, and some people thought there were two separate steels, like the Age of Ultron steel with an Ultron back cover and a Vision back cover.
However, there is only ONE steel book that is reversible. The Batman cover is the front cover, while the Superman cover is the back cover. So if you display the Superman cover, the title on the spine will be upside down.
In other words, it's one steel book packaged two different ways, i.e. either displaying the Batman cover or the Superman cover.
Just an FYI for those who ordered two copies to have both covers.