According to animeanime.jp, the U.S. theatrical release of Momo e no Tegami
was announced at the opening of the movie on April 21st. The movie will be distributed by GKIDS
, and is planned to be released towards the end of 2012. The movie is also planned to be considered for nomination as the Best Animated Feature at the 85th Annual Academy Awards.
GKIDS is a U.S. film distributor company that has a solid reputation for its successful track record of securing various Best Animated Feature Oscar nominations, as well as securing Japanese titles ranging from Nausicaä of the Valley of the Wind
to Summer Wars
Momo e no Tegami has already been well-received worldwide at various film festivals including the 15th New York International Children's Film Festival, the 2011 Toronto International Film Festival, and the 27th Warsaw International Film Festival. The movie has also been awarded the Platinum Grand Prize at the Future Film Festival of 2012. Momo e no Tegami will also be released in Korea during the summer, as well as China and Taiwan within 2012.
Sources: Momo e no Tegami official facebook
(Japanese), Future Film Festival official webpage