Now, I never even thought that the PC would ever get a PC port, but Rockstar has spoken of it, and basically says that there aren’t any plans to do it right now, but wouldn’t completely rule it out as a project further down the line.
"As of now, there are no current plans to bring Red Dead Redemption to the PC platform. If that should change, we will let you know."
Most of Rockstar’s other titles, especially the GTA series, has seen console games come over to the PC – eventually. Sometimes it takes a year or so though. So maybe it’ll happen next year.