Please post all your speculations of what you think the next expansion will be about here and brag how right you were after Blizzcon!
My two cents will be in favor of the "Warlords of Draenor" with two possible approaches
First approach: The alternate timeline in past Draenor
The history of this place is similar but not the same as the one in our "universe"
(Thrall: Twilight of the Aspects had one of these)
A major villain has managed to get himself there from our timeline and intends to wreak havoc upon us from there
("Daddy they said I was not worthy plz halp")
Wrathion and Anduin get their asses to this Draenor for some story progression
The alternate timeline would have major characters from Draenors history as hostiles and referred to as Warlords
They would all have a force/clan of their own
Expect following characters to be "Warlords":
-Grommash Hellscream
-Ner'zhul/Gul'Dan
-Deathwing
-Teron Gorefiend
Second approach: We travel back in our timeline to Draenor but what we find is not our history but instead our actions there will make it be
(Example: we help Orgrim defeat Blackhand)
Wrathion and Anduin yet again get their asses to this Draenor for some story progression
(Example: Use Wrathion to make Dragonmaw Clan)
From here on I will list some stuff which applies to both approaches
Horde and Alliance factions:
-H: Blackrock Clan led by Orgrim
-H: Frostwolf Clan led by Garad
-A: Alliance Expedition led by Turalyon
-A: Draenei led by Velen
Towns:
-H: Hellfire Citadel
-H: Zeth'kur
-A: Fortress Auchindoun
-A: Temple of Karabor
Dungeons/Raids:
-Deathwing's Lair
-Shattrath
Let me remind you that these are just my guess on what would imo work out best if Warlords of Draenor happens to be the next expansion.