Indeed, and most of the FF7 mods break cloud saving and steam achievements. There is a mod for 7 that changes the UI to match FFX, and it looks gorgeous, but you need to convert the stream release to the 98 release, sucks.
Thankfully the 8 mods, music, cleaned up backgrounds, cleaned up triple triad and menus, don't break cloud saving and achievements, they do have problems with making the game crash/use a ridiculous amount of memory though, converting to PS music was the only stable FF8 mod I have used in my experience.
I'd be surprised if we see any mods at all to be honest, outside very minor things, SE doesn't like people doing their own things with their creative visions so it's almost certain it won't come with built in modding support, very few big studio games ever do.
I hope it has built in Xbox button queues for controllers though instead of "Button 1" etc, that would really disappoint me if it doesn't. Edit: someone already posted that above, my bad.