Maybe not open world, but they're certainly not just regular sized BF maps.
That 1 video is talking about 1 location, Omaha. Thats a heck of a lot of variety to throw into a BF sized map. To me it looks like its far more open and varied, with similar locations (most likely scaled down drastically) to GTA5, with trailer parks, downtown industrial area, high society living and shopping etc.
Its a heck of a lot for 1 BF sized map. Somewhere like the Shanghai map, looks like it could be comparable to the inner-city portion of that video, in terms of quantity and variety of similarly themed buildings. Assuming theres a bank in that region, a town hall, and probably more, thats a decent size, and thats just a portion of what was shown in that video. The only similar level of variety you tend to get in BF maps is like Metro, park, subway, inner city. But they're tiny, narrow and certainly nothing like what those videos showed.
So maybe it wont be open world, but it certainly looks like the locations are on a scale far bigger than we're used to seeing.
Id love to see them take this in an MMO direction, with a GTA5 sized map and allowing hundreds of people within the city in grouped pockets, so you're only online with people in your general area. I dont know if this is anything like that, but i think it'd make for a fun experience.