Let me just quote this part of the Class Reforms post:
4. Setting Actions and Traits

The following reforms will be made to the conditions for setting actions and traits:

* Upon learning an action for your current class, that action will automatically be set to the action bar and cannot be voluntarily removed. It will be possible, however, to move the action to another slot.

* Action costs will be abolished. Instead, a cap will be imposed upon the number of actions from other classes that can be set. The cap will be determined by the level of your current class.

* Players will no longer be bound by level restrictions when setting actions from other classes.
For instance, a level 1 pugilist will be able to set a level 30 gladiator action. However, the effectiveness of that action will be scaled down accordingly.

* All traits will be made class-exclusive.
Adjustments will be made so that certain actions will only unleash their full potential when paired with traits belonging to the same class.

* In conjunction with the above changes, the Actions & Traits interface will undergo redesign in order to make action placement and repositioning more intuitive. Readying an action for use will become a two-step process: players set an action, after which they will have the opportunity to rearrange the action bar.
It says you can move all your actions and traits as you like.
You'll still be able to select and set the abilities (and traits?) from other classes but the abilities and traits from your current class can't be removed.
You can still macro every ability how you like and with the addition of UI addons (though I'm not sure I like that addon system) you'll be able to do even more.

People should read the letters and dev posts, then take a step back and ask themself if it's really an issue worth complaining about or wait till further information is provided.