I've been playing a bit of Classic lately, and with all the rumours flying around about the potential upcoming Death Knight class being added to the game, I thought I'd share a theory.
Back in one of his AMAs, Iksar was throwing a few theories around about what might become of classic, and he said this:
One that replaces classic. Rotates, but not super often. Think Classic –> MSOG, then 6 months or a year later it rotates to something else.
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Source)
He only mentioned Gadgetzan as an example. What if the next expansion is Northrend-themed, and Classic mode rotates to what was then Wild (or Standard) mode when Knights of the Frozen Throne came out? Or, perhaps more likely, the Spreading Plague/Fiery War Axe nerf patch.
I would be pretty geeked about that as that was the time when I first started playing competitively, trying to rank up and collect cards.