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Water Pokemon Master from Pokebeach ( http://pokebeach.com/ ) has posted an interesting theory that the first information about gen 6 will come in December.
As for Ash losing to a Gen 6 Pokemon in the Unova league, I cannot find any sign of Ash facing Virgil (Eevee trainer) before December 20th. So this combined with the above theory could lead to the conclusion that the "missing" Eeveelution (Dragon type) will be used by Virgil to defeat Ash.