The version implements an additional filter - "Discussion status", allowing to filter the threads based on their locked/unlocked status. A new option is added to allow the admins to decide which additional filters should be enabled (Locked/Unlocked status is the only choice for now) and decide where exactly these fields should appear in the form.
Another enhancement in this version is the ability to hide the prefix filter from the form, as an additional option for the setting "Disable default filter fields".