Don’t read anymore if you don’t want to be somewhat spoiled about the upcoming season 4 and season 5 episodes. Looking on the IMDB site there are some episodes with descriptions, and we can make some guesses as to what happens in them.

Episode #4.9
As the survivors of the prison assault try to regroup, Rick and Carl stumble upon a vacant house in the forest. Meanwhile, Daryl and Beth realize they are being watched by someone, and a new threat begins to emerge.

Episode #4.10
The scattered groups begin to reunite, but it becomes apparent that the mysterious killer may still be at large.

…

Episode #4.16
With most of the group taken by the enemy, Rick and Carl are left once again to fend for themselves. They head on the lonesome road for Washington D.C.
Source: IMDB

From these descriptions we can see that episode 9 will introduce some type of new possible enemy as it says Daryl and Beth realize that they’re being watched. Who could it be? If you’ve read the comics then you probably think it’s the hunters, as I do. The hunters are basically a group of people who are not skilled enough to hunt animals for food so instead they hunt and kill humans for food, i.e. they’re cannibals. The description for episode 10 says that there’s a mysterious killer, could this be referring to the one who fed the rats or killed the rat in the prison (Lizzie?) or is this referring to whoever is watching Daryl and Beth?

Then there’s the season 4 finale description, which is odd that it’s been posted already, and it sounds like members of Rick’s group have been captured which definitely makes me think it’s the hunters. Exciting, can’t wait until season 4 returns in February.

Season 5 episode 1 already has a description for it and we see that Rick is still alive. It also says the “group” so does Rick and Carl save everyone in the season 4 finale?

Episode #5.1
Rick and the group is heading to Washington DC, where they meet new danger and a new enemy. Once again, Rick must do whatever it takes to keep the rest of the group safe.
Source: IMDB

Also, there is word that a character, who is still alive in the comic book currently, will die in season 4. The only possible choices for that are: Rick, Carl, Michonne and Maggie. I would hate to lose any of these characters but some have said that it will be Maggie as she wasn’t spotted at the season 5 set and Lauren Cohen has been quiet on her Twitter which is odd for her. Who do you think it will be?