It completely depends on the personality of your child and the preschool options.
My DS, who was reading sight words starting around 2, never had any trouble with day care. They did tumbling, dance, crafts (totally open-ended without a project goal), educational computer games, music, food preparation, swimming lessons, story time, trips to the park, and lots of blocks and books, and toys etc. They believed that young children learn best through open-ended play and since there was going to be plenty of didactic instruction in kindergarten, there was no need to do very much of that in pre-school.
