The official Japanese Pocket Monsters movie website has updated with a new interface for next years 14th Pocket Monsters movie. The trailer which was shown at the end of Movie 13 The Ruler of Illusions Zoroark (幻影の覇者 ゾロアーク) in Japanese theaters has been posted on the site. The website confirms that the 14th movie will take place during the Best Wishes saga and it shows the new 5th Generation Pokémon Reshiram, Zekrom and Victini. The movie is scheduled for release in Japanese theaters in the summer of 2011.

Source: http://www.pokemon-movie.jp

This trailer certainly looks better than the first one for Movie 14, which just showed Ho-oh and Lugia. They weren't even in the final movie!
I especially liked the last part showing Reshiram and Zekrom above the clouds with their tails "activated." It would be interesting to see a battle happen there during the movie.