It will be a big update, but I haven't really seen anything to indicate if it will actually be good. We know a big part of it is shopping. Hooray for anyone with a shopping fetish I guess. Vicky is introduced, so hooray for people who were getting bored with all the incest we weren't having right now. We know there's at least one movie. But we don't know what happens during it. My best guess is sex with Alice in front of Ann, but maybe it falls short of even that. We know there's more scenes with Ann, but if it never progresses beyond a blowjob with her, then meh. There's dating Lisa stuff, but I'm guessing that doesn't end with us screwing her. It's more likely that we get a new blowjob or anal scene with her. Maybe not even that.
In short, this could just be a lot of pretty pictures, and more variations on blowjobs or stuff we've already done. We maybe screw Alice for a movie, but again... screwed her a lot already. My guess is that .9 doesn't advance anything too far, and makes it more clear that sex with Ann and Lisa isn't going to happen by 1.0.