Re: Has Superman gone through with his threat to renounce his US citizenship?
No. It was a one-off story in an anniversary issue that the media made WAY WAY WAY WAY too big a deal out of. They never had any plans to follow through with anything but the main Superman Vs. Lex Luthor story in that.
2011: "This movie sucked because of executive meddling."
2016: "This movie sucked because it didn't have a designated meddling executive."