I'd say 86 to 90. Of course it will probably be higher for me personally, but too many people have a very different view on what FF7 should look like, you can not make them all happy. Some revierwers wont like the story changes, some might dislike the open worldiness of it or god forbid some will detract points for low res textures.
I am sure there will be lots of filler quests (go here kill that, get reward), I dont think they will manage a 180 on this front. Square has never been good with side quests in FF games. Its what I expect and I am kinda fine with it because I just want to spend time with the gang, but for reviewers who are not so deeply engrained with the franchise, this will definitively detract from the score.
Would be nice though to see it get the same praise as Like A Dragon Infinite Wealth.