According to the official website, the first episode of Muv-Luv Alternative: Total Eclipse
will be shown at Anime Expo 2012 in Los Angeles on July 1st, simultaneously with the TV airing in Japan.
Muv Luv TE official website (English)
Trailer on Youtube (longer version)
Along with the preview, a live stage with Kuribayashi Minami
and the executive producer of the anime will be held.