I was curious what the next expansion might be and I found some interesting rumors, but its all speculative.
Being able to switch sides has been the longest-rumored feature of a possible expansion, but i don't really see where the advantages are in doing something like this. Endgame quests are fairly generic and most instance rewards are supplied by "neutral" factions anyways. The only reason I could conceivably see myself doing this is to switch my Alliance characters into Horde characters since everybody I know plays Horde.
What do you think?