The trailer is used to showcase the game's art style. Not the movement.
There's a reason why the enemies just run in straight lines. They need some brainless gameplay to catch the attenion of new players. They won't be interested if it's people bunnyhopping around the map at max speed. They won't even know what's going on.
99% of all gameplay trailers are like this. Get people to run in straight lines, pretend it's gameplay while it's actually just showcasing the art.
You'll know what the movement is like when the closed beta is out. No point in complaining about something from watching pseudo gameplay