'This Sorrowful Life' is the penultimate episode of Season 3 that will set up the events to transpire in the finale. As Season 2 proved, big things can and will happen before the finale. The Rick and Shane conflict was resolved in the Season 2 penultimate episode. I suspect something major will happen at the prison this Sunday and one of the story threads will be tied up, or one of the characters will be sent packing for good.
Hopefully Merle won't be offed considering he appears in two of the seven new images which you can view in high resolution by clicking on each below. Sometimes when characters get the spotlight during an episode *cough* Dale *cough*, their end is nigh.
The Walking Dead Season 3 episode 315 'This Sorrowful Life' premieres this Sunday on AMC at 9/8c.