FULL SPOILERS:
Confirmed deaths in 4x08:
Sahsa
Hershel
Beth & Judith (AMC may not show the dead baby's body, but it will be implied)
Bob
Tara
The Governor
All extras and unnamed (death by bullets/walkers)
Confirmed events to take place in 4x08:
The assault on the prison causes the fence to come down, walkers are everywhere and this causes chaos during the firefight.Survivors of Rick's camp will escape but be divided, almost similar to the season 2 ending at the farm.Rick, Carl, and Michonne will be one group.Tyreese, Glenn, Maggie, the two little girls, Lily and her daughter Megan, and Daryl will be the second group.Lily will cause the Governor's death, then be saved by Daryl as walkers corner her and Megan.Rick has a breakdown as he see's Judith/Beth die.Same for Tyreese as he learns of Sasha's death.Carl kills Tara in cold blood, similar to what he did to that boy in season 3.Episode ends with Michonne overlooking Rick and Carl sitting by a campfire.
Confirmed after midseason break (4x09 -4x16):
Eugene, Abraham, and Rosita have all been cast and are set to appear in 4x10.Morgan is set to appear in two unknown episodes.Season filming wrapped up last week, expect more spoilers to come out over the next few days.