Images from the February 2013 Corocoro are now available and they reveal the official Japanese names of Xerneas and Yveltal as well as their artwork, height and weight.

Xerneas	Yveltal	Movie 16
Xerneas (ゼルネアス) Height: 3.0m Weight: 215kg	Yveltal (イベルタル) Height: 5.8m Weight: 203.0kg	4 Genesect's, Red Genesect the leader.

On January 9th, 2013, the official Pokémon Twitter feed posted the phonetic spellings for Xerneas and Yveltal. "The English phonetic spellings for the new Legendary Pokémon are Xerneas: ZURR-nee-us and Yveltal: ee-VELL-tall."


Source: https://twitter.com/Pokemon/status/289143489537642497

Movie 16

CoroCoro also revealed information on the upcoming 16th Pocket Monsters movie Extremespeed Genesect (神速のゲノセクト) which will be relaed in Japanese theaters on July 13th, 2013. There are four different Genesect in the movie and the Red Genesect is the leader. It was also revealed that it will relate somehow to the new anime series Pocket Monsters Best Wishes Season 2 Episode N (ポケットモンスター ベストウイッシュ シーズン2 エピソードN) which begins airing on January 17th, 2013.