I think weapons need to be tweaked and pursuit needs to be reworked. I don't want pursuit to be completely removed because for some characters it's literally the only skill they can pass down and I love inheritance. Of course, it could always just be removed and replaced with something else. Tiltyu/Coirpre need to join at a higher level so they're more usable and maybe a couple of other characters could join a bit higher too.
I don't want an avatar, but if IS is so hellbent to add one (especially since their most successful titles have all featured one) just let it be Oifey. Pick Oifey's name/gender and maybe even dictate his Gen II class and leave it at that.
I don't want the huge maps to be chopped up into smaller chapters which I just...I dunno I can see them doing that to make them easier to digest. I love the big maps because it's reminiscent of playing a hex-and-counter wargame.
At the moment I'm not super confident that it will get remade.
It honestly surprises me that it hasn't though, because it seems like the sales numbers for the game were excellent, but it might have to do with dealing with how different it plays and how big the maps are. I'm also not super confident they will retain a lot of features, although some of my very good friends that know the series much more than me are confident it won't change too much because apparently Shadows of Valentia didn't have huge changes. I wouldn't know because I haven't played it.