Why are so many people saying Metroid? We will see FF7 this year, but we won't see metroid until around 2021 most likely.
I imagine that the remake will be out in full force first before MP4 whether split into parts or released altogether if plans had changed ...
FF VIIR is pretty far into development by now since it was last 3 years ago when we've seen footage. By now SE probably has the world/level design and the mechanics down already. They'll probably make a couple of modifications near the end such as using ray tracing on the next gen console ...
What time gap between each part? Also, what you saw in 2015 is: http://www.pushsquare.com/news/2018/03/final_fantasy_vii_remake_sounds_like_its_still_a_very_long_way_off