That could happen if Iris lives. She and Barry have gotten together; the nonsense part of the romance will-they-won't-they is over.
On an unrelated note, it only just now occurred to me that the third season of the Flash is the first one where they changed the intro monologue halfway through. Kinda like Agents of S.H.I.E.L.D., the season is broken into multiple plot arcs with connections between them, instead of one single season-long plot arc (S1 Reverse Flash, S2 Zoom). Interesting.