In a new interview with Director Tetsuya Nomura, we find out that the upcoming Final Fantasy VII remake will feature some "dramatic changes" to the ATB (Active Time Battle) system.

According to Nomura:

And of course, that being said we want to clarify: We’re not going to be changing it into a shooter or something like that. We are going to be bringing dramatic changes, but we want to make sure it’s still recognizable.

However in regards to the 3D models from the movie:

[We] don’t intend on utilising the 3D models of Advent Children as is because, well, it’s a different technology, and it’s actually been almost ten years since Advent Children was first released.