It turns out maybe that small mistake some months ago was more of a leak than an error? With Microsoft pushing its backwards compatibility initiative on the Xbox One, people were wondering why Rockstar didn't jump on the bandwagon. Red Dead Redemption popped up as a backwards compatible title a while back, but was swiftly removed and Rockstar declared it an error on Microsoft's part.

The Xbox 360 and PS3 classic achieved legendary popularity back when it was released. An open-world adventure game set in a fictional corner of the wild west, it followed the exploits of John Marston, a former outlaw whose family is held hostage by the government in exchange for Marston's services as a freelancer mercenary, tasked with hunting down his former associates.
Fans and hopeful onlookers alike have been begging Rockstar to release a PC version of the game pretty much since release, seeing as it has been universally acclaimed by both reviewers and fans. Red Dead Redemption has always been lauded as being basically "Grand Theft Horse", but this little joke was always meant in a positive manner.