Taken from Gameinformer thread
I didn't see a thread for this news specifically.
-In regards to FFVII remake. Looking at the FFXIII saga as a model of release (three full-fledged games). Each game will be the size of a FFXIII game is specifically stated. In other words full scale 30+ hour RPG, and they also say plot wise nothing is off the table in terms of changes. They clarify they aren't changing everything but Kitase, Nomura, and Nojima feel since they were involved with the original game that they have the liberty to add / change what they want while still making fans happy. They also state they want FFVII Remake to gave a much shorter development cycle than FFXV.