Dan Jurgens created Booster, who has been a pet character of his who has shown up in a variety of books Dan wrote. Likewise, Waverider is another, similar Jurgens creation.
When Jurgens created Booster and had him raid various artifacts from a museum to become a super-hero, Jurgens' intent was always that Booster's power suit was an advanced power suit worn by Lex Luthor. Post-Crisis continuity got in the way of this but with Lex now sporting a power suit, I wonder if we're in for a re-establishment of Jurgens' original premise.
On a related and weirder note, as of Convergence, the older, pre-Flashpoint Booster Gold became the new Waverider. Given that Waverider was a time travel character, a Jurgens pet creation, and is now explicitly a character from before Flashpoint, he seems like an easy inclusion in Jurgens' Superman run given that he would likely be aware of what's going on with the timeline and have a history with Clark and Lois.