A Reddit thread detailed a number of clues that suggests just this. The first came in the form of Mirror’s Edge Catalyst being featured on Steam’s new library UI. Unfortunately, according to Steam’s UI designer Alden Kroll, this is simply wishful thinking on Steam’s part. But since then, more pieces of information that may suggest so have appeared.
These includes a test app that’s been updated with Origin integration. There is also data indicating that The Saboteur has been played on Steam, despite not being sold there. Finally, Dragon Age II also got a new package a week ago on Steam. Ultimately all of this doesn’t mean much until something more tangible is observed. But it does suggest that EA is at least putting its older titles back on Steam, whether directly or via Origin integration. But until more information is officially released, it’s better to take all this with a pinch of salt. (Source: Reddit via PCGamesN, Alden Kroll / Twitter)