Although actor Steven Yeun's name disappeared from the opening credits, the character's fate has not been directly addressed on-screen, as the most recent episode was a Morgan-centric episode told mostly in flashback. But never fear: Sunday's episode does deal with Glenn's mortal status... sort of.
Although you won't see any physical proof of Glenn's demise (or survival), the episode traffics heavily in the emotional fallout. In other words, Glenn's wife Maggie (Lauren Cohan) and the other survivors make their own assumptions about what Glenn's prolonged absence from Alexandria must mean.
But even though many of them are ready to call time of death, the episode ends with a sign of hope that Glenn might not be out of the picture entirely.