Kotaku says that the PC Gaming Alliance, a group of game developers and hardware makers, is working on building a standardised set of system requirements for PC gaming.
There aren't a lot of details here (any, really), but from older articles, the PCGA has been wanting these ratings for a while. It'll help people who are trying to buy a PC and need to know exactly which games it'll be capable of playing, which is much different from the process of matching up video cards with benchmark scores that consumers have to do now.
Although their intentions seem to be good, firms like Activision Blizzard (maker of World of Warcraft and many other games) have left the alliance for some reason or another.
For more on the PC Gaming alliance, hit up Kotaku.