Toshiyuki Watanabe announced as the composer for Ginga Kikoutai Majestic Prince. 5 orchestral samples available here (sounds nice):
http://www.mjp-anime.jp/13music/index.html#update
In other news Koutetsu no Vandetta, an OVA series that has been delayed since 2011, had it's first episode premiered on Nicovideo today. The music is composed by Hitoshi Sakimoto.