Currently released :
-Onikakushi-hen : Chapter 1
-Onikakushi-hen : Omake 1
-Watanagashi-hen : Chapters 1-4
-Tatarigoroshi-hen : Chapters 1-5
as for the rest, unless there is any dropping announcement, we can assume that these 3 chapters will be translated in the future.
also, we don't have any information if any of the current scanlation group, or any other would translated the rest.
just stick with this site, for further updates :
http://hinamizawa.e-n-m.net/news