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It could be anything. Unless there is an official announcement form the IITs, no one can tell this for sure.
But going with the similar trend, one can expect it to be a mixture of objective and subjective questions as is the case now.
Hope this helps.
Ashwin (IIT Madras).
not many resources are available so as to make it subjective
it will be objective examination and the pattern will same as that of today. the idea of subjective exam has not yet passed by the council of ministers of human resource and development, it will be passed about in april 2012 and will be implemented after two years