The Trinamool Congress is all set to finally release its manifesto on Wednesday after the event got postponed last week due to party supremo Mamata Banerjee’s injury in Nandigram. <br /> <br />While the TMC manifesto will stress on social sectors, sources have told India Today TV that Mamata Banerjee will make a major announcement to include four key caste groups under the Other Backward Classes (OBC) category. <br /> <br />Among them, Mahishyas, who form a substantial chunk of the population in the Purba Medinipur district, will be the most significant addition. Mamata is herself contesting the Nandigram seat from the district, which the community dominates.