Images and information from the March 2013 issue of Corocoro have begun to leak and the much hinted at 6th Generation Eevee evolution has been revealed.
Nymphia (ニンフィア) is an evolved form of Eevee but its type and evolution method have yet to be revealed. Nymphia is 1.0m high and weighs 23.5kg.
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The full title of this years 16th Pocket Monsters movie was also revealed as:
Extremespeed Genesect: The Awakening of Mewtwo (神速のゲノセクト ミュウツー覚醒)
Further details will be posted as they are revealed.