Nah, Injustice is just an alternate world/timeline. At the end, Regime Superman gets his ass kicked by a Superman from a world where the Joker didn't...
As a reader of serialized narrative, I'm getting used to these kind of long term plans being dropped or changed.
I'm sure we'll get more infos about...
I like the idea of Krypton being destroyed by an external force but it should be an iconic villain like Brainiac to do it instead of a newly created...