Nomura commented on it from the verge E3 2018 interview.
Nomura started out by saying:
“We are developing [Final Fantasy VII] in parallel, and it’s not just in the early concept stages. We are actually in development.
So right now, it’s like I’ve been putting in 100 percent into Kingdom Hearts, 100 percent into Final Fantasy VII, 100 percent into Kingdom Hearts… just going back and forth. It’s just like [working on] two titles is just going to be one [after Kingdom Hearts III’s launch]. That’s pretty much how I see it.”
Nomura started out by saying:
“We are developing [Final Fantasy VII] in parallel, and it’s not just in the early concept stages. We are actually in development.
So right now, it’s like I’ve been putting in 100 percent into Kingdom Hearts, 100 percent into Final Fantasy VII, 100 percent into Kingdom Hearts… just going back and forth. It’s just like [working on] two titles is just going to be one [after Kingdom Hearts III’s launch]. That’s pretty much how I see it.”