Future connections we won't know unless Blizz posts them.
All completed connections so far:
Stonemaul + [Dunemaul + Maiev + Bloodscalp + Boulderfist] pvp
Lethon + [BlackwingLair + Haomarush + Detheroc + Dethecus] pvp
Daggerspine + [Aegwynn + Gurubashi + Hakkar] pvp
Malorne + [Drak’Tharon + Firetree + Rivendare] pvp
Smolderthorn + [Anub'arak + Chromaggus + Garithos] pvp
Gul’dan + [Black Dragonflight + Skullcrusher] pvp
Lightning Blade + [Burning Blade + Onyxia] pvp
Gorgonnash + [Balnazzar + Warsong] pvp
Auchindoun + Laughing Skull pvp
Blood Furnace + Mannoroth pvp
Dalvengyr + Dark Iron pvp
Scilla + Ursin pvp
Tortheldrin + Frostmane pvp
Dentarg + Whisperwind pve
Fizzcrank + Aggramar pve
Nesingwary + Vek’nilash pve
Echo Isles + Draenor pve
Connections coming Monday November 25
Nathrezim + [Chromaggus + Garithos + Anub'arak + Smolderthorn] pvp
Azshara + Azgalor pvp
Arygos + Llane pve
Cairne + Perenolde pve
Winterhoof + Kilrogg pve
Zangarmarsh + Hellscream pve
Connections coming soon Monday December 2
Spirestone + [Drak'Tharon + Rivendare + Firetree + Malorne] pvp
Coilfang + [Dalvengyr + Dark Iron} pvp
Ysondre + Magtheridon pvp
Fenris + Dragonblight pve
Icecrown + Malygos pve
Future connections coming soon, no date yet
Crushridge + [Anub'arak + Chromaggus + Garithos + Nathrezim + Smolderthorn] pvp
Andorhal + [Scilla + Ursin] pvp
Darrowmere + Windrunner pve
Quel'dorei + Sen'jin pve
Velen + Eonar pve
Plans for all connections can change at any time.
Even more realms coming soon, after the above are completed
realms listed in brackets [ ] are previously connected realms, making for some 3-way and 4-way and 5-way connections.
The first 6-way connection has been scheduled, with Crushridge.
some questions that have been asked in every connected realms thread:
Your realm's first connection (or even 2nd or 3rd) won't necessarily be it's only one. They'll connect more as needed, but only 1 at a time, so it'll take a few weeks.
Lots more realm connections will be coming over the next several weeks, just be patient. No, we don't know which ones, yet. They're not going in any particular order.
No timeline has been given for how long this will all take. It'll take however long it takes.
Don't expect faction balance out of this, that's not what they're trying for. They say they're taking that into account, but the main goal is population total.
Your 11 character slots will stay separate for each individual realm, giving you 22 slots for a connected pair. (or 33 slots or 44 slots for a 3way or 4way connection, or even all 50 slots on a 5-way).
Now, what is Blizz going to do for any realms that don't get connected, so they can have more than 11 slots, too?
Duplicate names on connected realms are fine. If my Durotan gets connected, I would then be known as "Weekender-Durotan", so we will effectively be getting a last name, but it's only needed / used for certain chats and invites and such ingame when dealing with someone on a different realm in your connection, like sending mail/gold/items to someone on another realm in your connection.
Blizz already said they are discussing ways to handle forums for connected realms, such as maybe a single forum for each connected group. No decision yet, but it will probably wait till all the connections are done before doing anything.
We also need something on the realm selection screen showing which are connected to which.
RP, Oceanic, Latin America, and Brazil realms will be soon, as they work their way through the list of 246 realms. They're not going in any particular order.
That's 49 realms connected so far and 27 more scheduled soon. Out of 246 realms total, that'll be 76 down and 170 more to go. It'll actually be less than that to go, since they probably won't connect at least the top 10-15-20 or so realms. So, maybe around 150 realms to go.