Is Battlefield 1 going to have cross platform multiplayer in the future.

I'll just have to echo Carbonic on this. We haven't said anything, and I very much doubt it'll happen. 

We are seeing a rise of PC & console cross platform (and I personally think that's great) but these games tend to be pad-centric, whereas for a game where shooting is a primary focus, it wouldn't be very fair to pit console players against Keyboard & Mouse users.