Didn’t one of the earlier drafts of the original Star Wars’ script have a closing crawl teasing the setup for the sequel?
From the second draft:
A ROLL-UP TITLE appears:
…And a thousand new systems joined the rebellion, causing a significant crack in the great wall of the powerful Galactic Empire. The Starkiller would once again spark fear in the hearts of the Sith knights, but not before his sons were put to many tests… the most daring of which was the kidnapping of the Lars family, and the perilous search for:
“The Princess of Ondos.”