Pokémon X and Y are a new series that is to be released world-wide on October 12th, 2013.
If you do not want any spoilers for Pokémon X and Y, do not read any further.
Although not too much is currently known, Pokémon X and Y take place in the Kalos region. The games are for the 3DS and sport 3D graphics unlike any other Pokémon game. There is also a new type of Pokémon in this Generation, the Fairy type.
Feel free to speculate about all sorts of things and post new information here once it is revealed!