During a recent panel with the Apex Legends developers at Respawn, Game Director Chad Grenier made it clear to fans that there will be a "ton of Titanfall" content coming to Apex in Season 9.
For those that are unaware, Titanfall and Apex Legends share the same universe. Of course, outside of some weapons and gear, there really isn't too much crossover between the two games that would make that shared universe explicitly clear. During the panel, Apex Legends Senior Writer Ashley Reed said that the games are very closely connected.
She says that "what's going on in Titanfall is a war" whereas "Apex is what happens after the war." The real meat and potatoes of the shared universe idea came from Grenier's follow-up comment.
"Next season, Season 9, you're actually going to see a ton of Titanfall coming back into the game in one way or another. So, I've told some people before, if you're a Titanfall fan hang on for Season 9."