Rockstar revealed that at this point there are no plans to bring RDR to the PC, but if those change, fans will be notified.

Red Dead Redemption is a Western epic, set at the turn of the 20th century when the lawless and chaotic badlands began to give way to the expanding reach of government and the spread of the Industrial Age.

Red Dead Redemption recreates the American West at the turn of the 20th century: a violent and turbulent time of rapid growth and change. Players become the partially reformed outlaw John Marston; blackmailed by the government, his family threatened as he is forced to traverse the vast and unforgiving expanses of the Western frontier in search of members of his former gang. In a dangerous world full of opportunistic criminals, corrupt officials and settlers battling the elements in a struggle to survive, Marston’s journey takes him from the dusty and lawless frontier to the civilized towns of the North, and down into a Mexico on the brink of a full-scale civil war.

Utilizing Rockstar's proprietary Rockstar Advanced Game Engine (RAGE), Red Dead Redemption features an open-world environment for players to explore, including frontier towns, rolling prairies teeming with wildlife, and perilous mountain passes - each packed with an endless flow of varied distractions. Along the way, players will experience the heat of gunfights and battles, meet a host of unique characters, struggle against the harshness of one of the world’s last remaining wildernesses, and ultimately pick their own precarious path through an epic story about the death of the Wild West and the gunslingers that inhabited it.