Merchant of wonders only for event or fixed ?

[Roy01]

as we know the upcoming update Cold Storage and Havens Mandate bosses will be boosted up, and chance to Merchant of wonders, so my question is this only for upcoming event or it will be fixed??

[Grimoir]

The dungeons are a permanent add. So I guess the merchant too cause it's not like you can spam the dugeon since it's still only a entry once per day