All the early OFFICIAL details can be found here: http://www.worldofwarcraft.com/cataclysm/faq/

With regards to minimum system requirements Blizz officially states: "We haven't yet released minimum system requirements for Cataclysm. That said, we do plan on making some graphical improvements, but we're always of the philosophy that gameplay and accessibility are more important than the most high-tech graphics available today. We want to keep a very broad audience, and that requires boosting graphics by very reasonable amounts as the years go by."

Time to start saving up for more hardware and your pre-order of the software for what I am sure will be a midnight release (date still unknown as of this writing):

http://www.gamestop.com/catalog/productdetails.aspx?product_id=75807

- Streborahp, Guild Leader