There are in fact 12 maps for the multiplayer. Some of the maps never had a focus done for them. I won't spoil what they are for everyone, but they are indeed there. Same goes for the weapons. It would seem that they were actually more focused on finishing the game than showing off what is in it. Let's hope so anyway.
there are 12 maps for some reason they only showed 6 here but in the last video there are two parts to it and if you watch both parts it gives a decent overview of all 12 maps.
Maps all look pretty big with a good mix of long and short gameplay. Just looks amazing