What I can tell you right now:
It's otome
It's fantasy
It's not terribly long (and will probably be about $5 on release)
More news coming eventually when things are further along.

hanako wrote:... I mean, it IS straight GxB as well, but that's not what makes a difference to dev time!
I have a good idea of what book it is...and let me say, it is a good one for a computer adaptationThis is actually a licensed adaptation of a 1980's fantasy gamebook - not from the choose-your-own-adventure line, but a similar sort of thing. Which means there are lots of choices and every choice branches the story, so there are a LOT of endings and ways for this to turn out. (And that's also why I'm not saying the name of it until it's finished, so you don't get too tempted to go buy the book and then not be interested when the VN version is done!)