UPSC has told so. Prelim changes for 2011 and from next(2012) year, mains changes too. And since prelim change was radical, then 2012 mains will also meet such changes. PS: This is entirely my opinion.
Hi nemesis and friends.... as per the performance of candidates in 2011 CSAT UPSC will make changes in the mains. But there is 50 50 chance...