Rockstar just released several new details on the Undead Nightmare pack here.
Here's some of the new stuff:
- Available for 800MP/$10 at PSN/Xbox Live if you own a copy of RDR, $29.99 in retail stores (no need for a RDR copy).
- New zombie mode: Undead Overrun. You will have to survive waves of zombies along with a friend;
- Missing Persons: Rescue survivors from hordes of zombies;
- Fully narrated, cut-scene filled single player (already known);
- Blunderbuss - A new weapon;
- And far more! Check out the Undead Nightmare article for full details.
IGN has also released a preview.
Check out the Undead Nightmare article whilst you're at it!