from the FIA website: FIA press release 32608
WORLD RALLY CHAMPIONSHIP
With immediate effect, the restriction on parts will be eased for new manufacturers in their first year of entering the Championship. A new manufacturer may ask the FIA for a waiver to use two additional engines without penalty, and a change of parts, as described in the Sporting Regulations.
The new technical regulations for the future World Rally Car will become effective from 2011. The WRC Car will be based on the current Super 2000 and Group N cars, fitted with a supplementary kit, which includes turbo and rear-wing additions. The kit must be able to be fitted or removed within a defined time limit, to be determined.
The current World Rally Car regulations will be extended to include the 2010 World Rally Championship, subject to technical controls. The new World Rally Car will be permitted to compete from 2009 and score points in the Championship from 2010.
From 1 January 2009, winning co-drivers in the FIA Junior and Production Car World Rally Championships will be awarded a world title.
so from what i understand the 2011 WRC Cars will be based of Super2000 and GroupN Cars.