CGI trailers add nothing to knowing what a game will be like.
Alll this trailer is tell me "There will be an Injustice 2". Telling people this in a tweet with a handful of text characters costs far less than producing a trailer like this...
A trailer like this will create a lot more hype than just a tweet. That being said, so would a gameplay trailer. But I understand why they would do this. Release a cgi trailer before E3 to create hype, and then gameplay at E3.