If you've been keeping tabs on what everyone's favorite crab has been disseminating to the community, you're familiar with the upcoming Dual Spec feature in patch 3.1. In an interview between Nethaera and Ghostcrawler, he goes into all the details of how it is planned to work and what to expect in terms of functionality. There are still a few unknowns, but for the most part it seems like they're ready for gamers to start testing it on the upcoming PTRs.
Rogues are one of the 4 classes that are considered to be "pure" DPS, as we have no other role to play besides damage dealer. While Mages and Warlocks have very different PvE and PvP specs, for most Rogues it's just choosing between daggers and everything else.