I just caught up recently.
This is my Season 4 death pool:
Warning: Spoiler!1. Glenn. He dies in the comics, which while they're not completely dependent of each other, it got me thinking. Then I noticed the fact that they've been grooming Maggie through Glenn - just like how they groomed Michonne through Andrea, and to a lesser extent Derle through Sophia and Merle.
2. Herschel. Not sure why, but I suspect he'll get off'd.
3. Beth, aka "Herschel's other daughter, the one that doesn't do anything". She doesn't do anything but take care of Judith. Now that there's, what, three dozen more people to do that, and she doesn't serve much purpose, I imagine she'll either be developed like they were setting up in Season 2, or she'll be off'd.
While not being killed, I could see Rick, Derle, and Carl all gaining a new vulnerablity, ie losing a sense, having an amputation, etc. I don't see Carol dying except to throw us off, which is bad writing uncharacteristic of what we've seen from the writers.
More Season 4 predictions:
Warning: Spoiler!I predict that Carl will become an antagonist, and that The Govenor will return, but unless they don't create a time gap between Season 3 and 4 (which they should), it won't be for revenge - at least not initially.