Today there was an event in Japan (Anime Japan) which shows us the new Sailor Moon Crystal opening, closing, new trailer and a preview of Act 27. We also found out that this season will have 13 episodes. Just do you know the manga has 11 chapters for the Infinty Arc.
Here is the Anime Japan event.
This is the new opening, In Love With the New Moon sung by Etsuko Yakushimaru
This is the first ending theme Eternal Eternity sung by Junko Minagawa (Sailor Neptune) and Sayaka Ohara (Sailor Uranus)
Lastly, this is the trailer
Here are some screenshots