First of all, the previews are awesome.
http://xboxlive.ign.com/articles/112/1127395p1.html
It's said to be a massive expansion to one of the best game this year. It will come out on Xbox Live/PSN October 26th for 9,99$ and will release on a retail disc alongside all previous DLCs and the game itself for 29,99$! (So it does not require a copy of Red Dead Redemption to play!)
The add-on will include a new single-player storyline, as well as brand new multiplayer content.
More details here: http://www.rockstargames.com/newswire/article/10611/new_details_on_red_dead_redemptions_undead_nightmare.article
And now this:
Mythical Creatures in Undead Nightmare: The Four Horses of the Apocalypse
Behold – the Four Horses of the Apocalypse. Pestilence, Famine, Death, and War.
This legendary quartet of doom is among the mythical creatures you’ll encounter while roaming the frontier in Red Dead Redemption: Undead Nightmare – stay tuned as we’ll be revealing more of them in the days leading up to the October 26th release of the pack on Xbox LIVE and PlayStation Network.
Each of the four horses possess special powers, provided you can break these raging beasts.
Death
With Hell following close behind, Death carries with him a violent wake that rattles through the skulls of the undead, causing a spectacular cranial explosion for any zombie it comes in contact with.
Famine
Attracting a swarm of insects wherever it travels, Famine's thin shadowy frame and crimson eyes mask an everlasting stamina.
Pestilence
A ghastly harbinger of plague and disease that's easily identifiable by its exposed wounds and ocular hemorrhaging, Pestilence possesses an exceptionally high pain threshold.
War
Given power to take peace from the earth, the fiery red horse known as War ignites a trail of flame upon all those in its path, turning the living and the undead alike into smoldering ash.
See these screens and more in high definition at the official Undead Nightmare page.
