By Keshav Bhat :
“As were approaching the launch of Call of Duty: Black Ops 4 on October 12, we now know the final list of multiplayer maps available in Call of Duty: Black Ops 4.
There is going to 14 maps available on Day 1, with 15 total after Nuketown launches for free for everyone in November.”
Source: N4G PC Call of Duty: Black Ops 4 – Launch Multiplayer Maps List