They're likely starting up a Nier sequel but it's still not really accurate to say that's their focus. Quick roundup for currently in development console projects at Square Enix Japan:My bad they are not opening Business Division 6, that division has already existed it just did not have its own recruitment page before, but it seems they are focusing on NieR in the division at the moment.
BD1
Final Fantasy VII Remake (PS4 timed)
BD2
Final Fantasy XV DLC (PS4/XB1)
New IP (tba)
BD3
Kingdom Hearts III (PS4/XB1)
Left Alive (PS4)
BD4
Dissidia FF NT (PS4)
BD5
Final Fantasy XIV ongoing dev (PS4)
DQ Builders (Switch)
DQ Builders 2 (PS4/Switch)
BD6
Dragon Quest X ongoing dev (PS4/Switch/Wii U)
Dragon Quest XI (Switch)
DQ & FF Itadaki Street Anniversary (PS4/Vita)
Project Octopath Traveler (Switch)
BD7/8/9
nothing atm
BD10
Secret of Mana (PS4/Vita)
Tokyo RPG Factory
Lost Sphear (PS4/Switch)
Extreme Edges team
various JP localizations (Tropico 5, Life is Strange BTS, The Avengers, etc)