[Joe.]

Spoilers in regards to the changes Season 3 will bring- Please have a read- also included is what happens with the prison in the comics-

Spoiler:

So basically here's how season 3 is going in regards to the trailer-

- We pick up where season 2 left off, the group round the camp-fire,
- Rick and Daryl discover the prison
- Rick pitches the prison to the group
- The group start clearing out the prison
meanwhile...
- Michonne and Adrea see an army helicopter go down
- They stay near the fallen helicopter
- Eventually, shortly after Michonne's trip to a chemist they are captured by the Governer and the Woodbury people
- First they are kept as prisoners
- Then the govener introdouces them to woodbury and the town
- Michonne does not trust the Governer as he has her Katana Sword
- Andrea bonds with the Governer and tells him of Rick's group
- The Governer goes to 'claim what's ours' and heads to a stand off moment with Rick outside the prison
- ...and Merle returns as a Woodbury guard!

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For those interested, here's how the whole prison fiasco goes down in the comics...
- The whole group settle into the prison for a couple of weeks/months
- During these weeks/months Tyreese [T-Dog on tv] starts dating Carol but then Carol kills herself when she finds out Michone had him in the gym
- Hershel's farm is still in-tact and Rick head's to get Hershel and his remaining family to join the prison
- After a couple of weeks while out looking for Fuel Rick see's a helicopter
- Rick, Glenn and Michonne [who joins the prison after saving the group from the remaining hostile convicts] head out to the crashed helicopter
- They find tracks and follow the tracks to Woodbury
- In Woodbury they discover the helicopter was from an Atlanta News crew
- The Governer has a vile setup where they get civilians to fight each other as entertainment
- The Governer chops Rick's arm off
- Glenn is taken captive and the Governer violently rapes Michonne
- Eventually Rick, Glenn and Michonne escape with the help of Doctor Stevens and his assistand Alice
- Before Michonne leaves she visits the Governer and uses a variety of weapons to paralyse him [including nailing his prick to the floor]
- They return to the prison, though Doctor Stevens is killed on the way, they are also accompanied by a guard [Martinez]
- Martinez flees to tell the Governer of the prison's whereabouts, Rick kills him
- The Governer finds the prison eventually and many characters are killed in the battle for the prison including Hershel's family [minus Maggie]
- As the group flee the prison Lori and newly born daughter Judi are shot dead and Rick and Carl just manage to get out alive- [they later meet with Dale, Andrea ect who have already fled]