Before the Legion expansion, the PvP medallion line of trinkets (often called the “CC break trinket”) removed all movement impairing and loss of control effects from the player, with a 2 minute cooldown. These trinkets were considered uniquely powerful PvP rewards, and they were considered mandatory in high level competitive content.
In Legion, the PvP template system deactivated all effects from gear. This meant that functionality like this had to be included in the honor talent system, along with alternatives.
For Shadowlands, we plan to restore this CC break functionality to a trinket, and make it a powerful PvP trinket option that comes exclusively from PvP. Players will be able to purchase this trinket for Honor or Conquest from one of the new PvP vendors returning in Shadowlands.