At the very top underneath tip missions:
Travel Power Stacking
Almost all travel powers are no longer mutually exclusive and can be activated at the same time, but only the strongest buff of each type (run speed, jump speed, jump height, fly speed, air control) will apply
This ensures that every power you pick or activate will only ever improve your mobility
Some exceptions:
Click buffs (eg: Inertial Reduction), external buffs (eg: Speed Boost), and auto powers (eg: Swift) still stack as they did before
Prestige Run powers (Ninja Run, Beast Run, Athletic Run) are still mutually exclusive with each other
Temporary jetpacks are still mutually exclusive with each other
Sprint powers still stack with other run speed buffs and are still mutually exclusive with each other
Some Peacebringer flight powers and effects are mutually exclusive with their vanilla counterparts