Pokémon X and Y

Pokémon X and Pokémon Y  are upcoming games in the Pokémon series.

Announcement
Pokémon X and Pokémon Y were announced by Satoru Iwata in the January 08, 2013 Nintendo Direct, titled "Pokémon Direct". It was shown at 6:00AM EST in all regions. It showed a trailer of the games and revealed a bit about the games. It revealed the three starter pokémon, Chespin, Fennekin, and Froakie, as well as two legendary pokémon, Yveltal and Xerneas. It was also revealed that unlike earlier Pokémon games it will be released on October 12th 2013 in each region. It also revealed that the games will be using 3D graphics instead of sprites.

Mega Evolution
Pokémon X and Y introduced a new type of evolution Mega Evolution. Mega Evolution is a temporary evolution that can be initiated in battle if the pokémon is holding the mega stone for their species, however only select pokémon can undergo Mega Evolution. It can be triggered in battle before attacking, and it allows the pokémon to attack after undergoing Mega Evolution. Only one pokémon per team can be in its mega evolution, and after the battle is over any pokémon in their mega evolution return to their normal form.

Trivia

 * Pokémon X and Pokémon Y have the shortest names of any pokémon games, having one letter each (not including "Pokémon").
 * They are the first main series pokémon games that are completely 3D.
 * The names of the games are likely named after the X chromosome and Y chromosome, due to the appearance of a strand of DNA in the Japanese logos for the games.