https://www.warhammer-community.com/2017/04/27/new-warhammer-40000-movement/
New movement information.
Running occurs in the movement phase like in
AoS. That would mean orders are definitely getting an overhaul because orders occur now at the start of the shooting phase and the Move, Move, Move order that makes you run faster would be useless. Likely going to be a “Hero Phase” like
AoS for orders if there are any.
"If you’re in combat at the start of your turn, you can Fall Back by moving away from the enemy. You’ll lose the ability to advance, shoot or charge that turn, and crucially, enemies will be able to shoot at you! This does, however, open up a vast range of tactical options for armies like the Astra Militarum, who will now be able to effectively deploy in firing lines, with each row falling back from any assaults in good order (if they survived) while the unit behind them fires at the attackers. It goes both ways though – if you have a dedicated assault unit that specializes in killing infantry (like Warp Talons) your opponent will find it much harder to pin them down in combat with heavily armoured units for the entire game."
No real comment here, I think what they said here says it all.