That would depend on the sort of multi-series product that they're making. If it is episodic for just FFVII. Then what it would probably be is you can buy the part 1 physically and the rest are available digitally upon release most likely. Later they'd bundled it all together. If they are doing what I think is possible and it's just all of the games and spin-off stuff, then individual physical releases would make sense.

So it just depends on what their planned thing is.