Of course, according to what I have read from the inusuku publications, it will be a game completely made from scratch and that is why it is called a "remake".
And if they said "remaster" which is to redo the same game but with a better drawing, personally it would seem like a waste...
As far as I've read the new systems that inusuku has revealed broadly is that the sister will have her own room, and the interface of the Hscenes will be something similar to this:
Of course it can change in the final product.
Also inusuku has shown some new images like this:
But from what I've read, I think this new game will cover all the expectations we have.
I think that the image of the banner that he shared today is from the sister of the remake since if you detail well, his hairstyle has the 2 characteristic little tails,
Sometimes I have a hard time distinguishing the girls when they have their hair down since they look a lot alike at the drawing level, it happens a lot to me with yui and fantasy's sister in the scenes of the hot springs right now that I'm coloring them
In addition, Monochrome's sister has bigger breasts than Fantasy's and this can also be seen on the banner.
I also think that for this new game and due to all the projects he has in progress he hired a drawing assistant although I'm not very sure, sometimes the translator gives me some inconsistencies
Hehe I think I'm a big fangirl of inusuku's work