DC Black Label Question

I noticed that the new imprint, DC Black Label, will be re-releasing many iconic DC series/titles. I tried to look online but wasn’t able to find an exact answer about how these re-releases will be different from the original releases, or if they will be at all. My specific question is for the one that is already released: All-Star Superman. Would anyone be able to tell me how this title is different under the Black Label release? Or if it’s been changed at all into a new edition?