Good news!:
18+ version of Grisaia will be available on BackerKit, as confirmed by Koestl's tweet.
Also, for those wanting both Steam and 18+ version, the other version can be add-on at a significant discount.
The Kickstarter for Grisaia will be launched this late Monday evening (PST) and expected to run through the end of January.
Update: Some (unofficial) info regarding the 18+ version by koestl :
The news you've all been waiting for: http://prefundia.com/projects/view/lets-bring-the-grisaia-trilogy-to-the-west/2814/
https://twitter.com/sekaiproject/status/520691412975644672
Seems that the release date of Konosora: Cruise Sign (both PS3 and PS Vita ports) has been changed from this October 30 to "unknown" due to quality reasons: http://5pb.jp/games/topics/4921.html
Most of the time 100% CGs + normal/good endings. Sometimes it depends on the VN. I don't play the bad endings if I know the VN has them, unless it's to unlock CGs.