Pretty much like NPC villages, except there are no NPCs, just lots of zombies living there. Maybe a giant zombie somewhere there that drops a special item?
I think that there's some pretty good evidence to suggest this is already in development, and will be in 1.9. For the nether at least.
We'll probably be able to trade rotten flesh to the zombie pigmen.
Unless you're talking about hostile villages on the surface. Maybe more like dungeons? Lots of ruined buildings and undead mobs? That could be cool, but they'd have to be rare. Otherwise they'd either make things too hard starting out, or else make mob-farming way too easy.
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We'll probably be able to trade rotten flesh to the zombie pigmen.
Unless you're talking about hostile villages on the surface. Maybe more like dungeons? Lots of ruined buildings and undead mobs? That could be cool, but they'd have to be rare. Otherwise they'd either make things too hard starting out, or else make mob-farming way too easy.
Now...here's three things wrong with that post. Pay attention so you don't make a fool of yourself.