Edit: Since Summer Update 2020 Goromaphone was added (Source)
I've done research on this before in another related question, What fansites don't have a replica item? So I will let you know what I've learned. But to keep it simple, it takes time and maybe will be implemented soon. Based on my investigation seen below on average Tibia usually waits 2 years to implement a replica, but this isn't always the case for example if you read about the Assassin Doll it took just 1 year after they left or the Music Box which took about 3 years to get implemented. Tibia wants to make sure the fansite won't come back before they implement a replica.
When it comes to Tibia the way the add the replicas depends on a couple of things:
- If the fansite had a fansite item to begin with and if it ever got implemented into the game
- The time the fansite left the program. Also, note replicas are for fansites that left the fansite programs at a certain point not for currently active fansites. You won't see replicas for active fansites that never left before because replicas are meant to be an additional way to obtain the fansite's item.
- Did the fansite ever have a fansite item implemented in-game?
For example, FotoTibia was a supported fansite from 2009-2011. Their item 
was never implemented in-game therefore it's not a replica.
- How long does it take to implement replicas?
It's not just the next major update....it can take time to implement replicas. I want to paste an important quote from the official forums:
The replica items are made, once a fansite drops out of the fansite programme and it is very likely that they will not return to the programme. So we wait some time before these items become available, to make sure that a fansite that comes back still has the fansite item available as it was before.
As long as the fansite is still in the programme, the items are a big motivation for people to contribute to a site. As I mentioned before, some admins have contribution systems on their site. They offer their fansite item as a reward for writing articles, for example, or submitting pictures, videos or other news. Others attract contest participants with their items, and help player created events gain popularity and interest by sponsoring their item as a reward.
We fear that if the items were available as replica ingame at the same time, that motivational factor would be reduced.
Source:
https://www.tibia.com/forum/?action=thread&postid=37505717#post37505717
RadioGoroma's fansite item is called the Goromaphone 
ended on April 23 2019 and the replica was added July 13 2020. So I wanted to kinda do a rough estimate on how long it takes for items to become replicas (Please see below for some, but not all examples). Basically Tibia waits a little bit to make sure the fansite doesn't become active again. Remember, they implemented the first round of replicas in July 2013. On average Tibia usually waits 2 years to implement a replica, but this isn't always the case for example if you read about the Assassin Doll below in which it took just 1 year after they left or the Music Box which took about 3 years to get implemented.
The Draken Doll was from the fansite Tibia Journey which ended July 2015 but the replica was implemented in July 2017 almost 2 years later.
The Imortus was from Exhiti which ended November 2014 but the replica was implemented in August 2016 almost 2 years later.
The Music Box was from TibiaSpace which ended in July 2013 but the replica was implemented in August 2016 about 3 years later.
The Assassin Doll was from TibiaBrasileiros which ended in March 2017 replica was implemented July 2018 a little over a year later.
The Bookworm Doll was from TibiaLibrary which ended October 2016 replica was implemented July 2018 almost 2 years later.
How can I know what replicas are available to get now?
Of course a good way to know which replicas are available right now is by checking with NPC Jorge at the Adventurer's guild. Their guild can be accessed by using an Adventurer's Stone in any city's temple. Players can get their first stone on the ship at the Island of Destiny or ask any Temple NPCs for an "Adventurers' Stone". You just need to start the Hunting for Tokens Quest. If your first talking with him you can say hi > replicating > help > yes. Then after you started the quest you go to him and simply say hi > souvenir. After this he will list to you all the available items that you can replicate. For example, right now he states:
17:48 Jorge: In this category I can offer you a Norseman doll, an abacus, a key of numerous locks, a friendship amulet, a mexcalibur sword, an orc shredder, a frozen heart, a phoenix statue, a dragon eye and a noble sword. Or: ...
17:48 Jorge: A hand puppet, a music box, an encyclopedia, a Durin doll, a medusa skull, a newspaper, a bag of spices or an Exhiti imortus. ...
17:48 Jorge: A mathmaster shield, a draken doll, an emblem, a crimson doll, an old radio, a bookworm doll, a golden falcon and an assassin doll. ...
17:48 Jorge: A dragon goblet, a pigeon trophy, a loremaster doll, jade amulet, goromaphone....
Sources with additional information:
- https://tibia.fandom.com/wiki/Adventurers%27_Guild
- https://tibia.fandom.com/wiki/Hunting_for_Tokens_Quest
- https://tibia.fandom.com/wiki/Unsupported_Tibia_Fansites
TibiaQA.com is a fansite. Please note that the only official website is Tibia.com. The game Tibia and the website Tibia.com are copyrighted by CipSoft GmbH.
