"reintroduced"

Hello Everyone,

May I ask what does"reintroduced" means in the following sentence:

The following Uniques can no longer drop, and will be reintroduced at a later date:Infernoclasp Forbidden Gaze Thunderstep, The Wailing Wall, The Fallen Formation Wylund's Stake, The Deepest Tower and The Remembered Tales.

Does it mean their unqiue bonuses will change or old ones will be same?