Admiral Buzzkill wrote:
When everyone's supposed to be born off the Codex, what's a cousin?
Exactly so. There can be a Kara/Supergirl, but there can't be a "Superman's cousin" in the same sense that she exists in the comics. Assuming that Zor-El and Alura existed, they didn't have a natural daughter.
There's a "Man of Steel" prequel comic that focuses on Kara.
Also in the movie there's a scene that lingers for awhile on a escape pod