I think that the first (probably another ten/fifteen years) will be ambient superconductivity in one form or another (it is actually a sub branch on nanotechnology). The second revolution will probably be in energy, one form or another of taming fusion of hydrogen (or actually deuterium) into helium releasing the mass difference into huge amounts of energy. The revolution will be mild if all they do is manage to make it effective only in 1000 MW plus type of plants, it would be a major discontinuity if they manage to get the volume of such a "plant" to the few cubic feet range.
There will be major development in biotechnology, but I doubt it will create major dislocations, first because of the lengthy process of approval, second, because health care is already taking 15% of GDP and there is little room for growth beyond GDP rate of growth left.
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