The double-pivot system is more like a 4-2-2-2, but lopsided...
Look at Spain's formation through almost all the knockouts during the WC..
Put Alvez instead of Ramos, Abidal instead of Capdevilla, MAsch instead of alonso, and Messi instead of Torres and you got the formation that we will be starting in many games this year..
You can dominate the midfield with a system like that, but it involves also the risk of being too narrow and your opposition can possibly exploit this with the use of wide players and compact defence (Like Switzerland against spain..)