Steven Yeun has appeared in photographs of them filming future scenes, with characters who have not yet appeared on the show, along with current actors. The Walking Dead producers issued a statement that we will see Glenn again on the show, in one form or another. He was not wearing zombie makeup in any of the aforementioned pictures I saw.

I'm good either way. If he survives, we still have Glenn.

If he dies, it is an object lesson in the point Rick tried to make to him and Michonne. Glenn died by being too trusting. It is one thing to forgive someone whose cowardice killed a friend, or to forgive someone who tried to kill you. Giving them the opportunity to do it again, repeatedly, is just frigging stupid, especially when you have family and friends counting on your survival, and your significant other has witnessed over the last year or so, the rather horrific deaths of her father, her family friends, and had her sister's survival dangled in front of her cruelly, only to encounter her corpse. You kind of owe it to her to try not to give her another reason to make her ugly cry face for a little while. If Michonne and Glenn had listened to Rick, things might have gone more smoothly on their run. For example, stash the limpers somewhere out of the way so you can come back for them when the herd passes. When Heath starts whining about overhearing Rick's admonition, the proper response isn't to defensively point out that you're not following his suggestion, it is to tell Heath "prove him wrong. Keep up." I'm all for doing the right thing and retaining humanity, but Christian charity is not a suicide pact. You don't have a moral obligation to unilaterally make charitable decisions with what you owe to other people, or to endanger others in order to do right by someone else. Even Nicholas knew Glenn should not trust him, and offered to draw a map. Glenn overrode even that idea, in order to service his forgiveness fetish. How many times is he going to roll those dice. He got lucky with Rick and with Tara, and with Abraham's gang, but eventually you're going to roll snake eyes. And really, in Glenn's case, helping Rick might have hurt his group as well, since they ended up trapped and Rick handcuffed Merle, who later captured Glenn and Maggie and got them tortured and nearly raped and killed, because of his grudge over the guy Glenn helped out of the tank. Also, Abraham's group turned out to be deluded, and Abraham snapped, which could have gone much worse in all kinds of ways. He should have listened to Rick, and accepted that some of the party might get killed going back.