So, the preview trailer showed that all the characters will be there (yes, ALL; it seems it will be like the other OAV); it's an OAV itself, it will be out this summer, and -quoting directly a fansubber sub- "the limitations of the TV will be surpassed in this daring OAV"... let me tell you that the trailer was very, very, very, VERY ecchi, it almost seemed a hentai movie. I knew that Green Green in origin was a hentai game, but the series went so well without hentai things, they could have continued that way.
As a note, Futaba-chan really looks great!! in the other OAV she wasn't cute at all, but here she breaks all cuteness records.
EDIT- @ZyReX, you got here first... it was a matter of minutes... grrr
