Giving everyone the hide, dash or disengage option as a bonus action
Those weren't bonus actions in the build they were showing off. If I'm recalling correctly the bonus actions available to everyone were:
Jump (One use per combat)
Help (Revive a downed ally)
Some sort of healing wind ability I think
Use Potion
Throw
Shove
Dip
Hide & Dash were actions, they used the normal action point. We didn't see disengage at all, I'm not even sure it was on the UI, so hard to say on that one.
Adding additional bonus actions will require a lot of balancing, some may not work out, shoving or throwing enemies of cliffs seems like the best use of your bonus action each turn for example. That would likely be hard to balance while remaining a bonus action.
If the rogue's cunning action was to be balanced with jump/disengage being a bonus action, it could increase the number of times it could be used instead if others can only do this once per combat, as an example of balancing.
Once we get early access and after a few balancing passes, we'll know if adding these additional bonus actions is a good idea.