The official Every Little Thing website has updated and has posted details for the upcoming Sora / Koe (宙 -そら- / 響 -こえ-) CD's which will now be released on July 13th, 2011 in Japan. Sora (宙 -そら-) will be the ending theme for Victini and the Dark Hero - Zekrom (ビクティニと黒き英雄ゼクロム) while Koe (響 -こえ-) will be the ending theme for Victini and the Light Hero - Reshiram (ビクティニと白き英雄レシラム). Below are the covers for the CD. Click on the images for more information.

CD+DVD/Jacket A	Limited Edition / Jacket B	Pokémon Limited Edition / Jacket C

Source: http://www.avexnet.or.jp/elt/news/110516_01.html