This is what is known so far:
It was revealed on July 6, 2012 at the Sailor Moon 20th Anniversary Special Live Event that a new Sailor Moon anime will premiere in the summer of 2013, and these are things that have been confirmed about the anime.
The anime will be streamed worldwide simultaneously.
It is said that both Kotono and Tohru will reprise their roles and Usagi and Mamoru.
It is confirmed it is an anime series, not a film.
The anime will not be a continuation after Sailor Moon Sailor Stars. It will be a whole new reboot.
Momorio Clover Z will provide the theme song, but it is unsure if their song, Maiden's War, will be the new theme and replace Moonlight Densetsu.