spoilers:end of spoilers
He states that they have so far identified 17. But it is implied that there might be much more left to be discovered.
I thought the spider titan was Kumonga/Spiga. But I don't remember its name being shown. I also thought that the titan in Germany may have been Anguirus. But it wasn't. The Mammoth looking one was new to me.
Most of the titans were awakened by Ghidorah. The map showed multiple countries being affected. But only a handful were shown on screen. Since all of them are said to be converging on Skull Island during the end credits, we might see much more in Godzilla vs Kong.
Also, how is there another spoilers:end of spoilers
MUTO? I saw it in the film, but I thought the ones in Godzilla were the only ones left. If this one was around, why didn't it become active when the other two did?
Finally spoilers:end of spoilers
I wonder if that lost city Monarch discovered Godzilla in is Atlantis. Because if it is, that might mean they intend to introduce Gamera in the future. The Heisei films revealed Gamera was created by them as a means to defeat Gyaos. The Heisei series was done by Toho. Not Daiei/Kadokawa Pictures (although i think they still own the character). Maybe Legendary can acquire the rights and bring that universe as well,