December's solicitation for X-MEN #3-4 reads:

EARTH’S MOST POWERFUL! CYCLOPS STORMS THE SAVAGE LAND!

The most powerful heroes of the dominant species on the planet, the X-Men rise to protect the world against any threat. From a new foe in the Savage Land to an old nemesis’ surprising return…
So, we know the X-Men will be in the Savage Land and face both a new foe and an "old nemesis." Given the location, it seems likely the old nemesis will be a Savage Land inhabitant, but it could definitely be someone completely unrelated.

Who do YOU think will be the "old nemesis" mentioned in the solicit? Place your bets here!

For those of you not aware of any (or all, shame on you) of the characters in the poll:

BRAINCHILD - Former Swamp Man and lackey to other, more prominent Savage Land rulers. He's not often seen, but he has considered himself king of the Savage Land on a few occasions.

GAROKK - Otherwise known as the Petrified Man, Garokk is an avatar worshiped as a god on the Savage Land. He's fought the X-Men a few times, but he's not completely evil.

HIGH EVOLUTIONARY - Ruled the Savage Land for a time, but is often associated with other Marvel properties; not just X-Men.

SAURON - Most prominent of the Savage Land baddies... you know him well. But is he really an "old" Nemesis since he was just seen not very long ago?

ZALADANE - High Priestess of the Sun People, summoner of Garokk, servant of the High Evolutionary, and eventual Empress of the Savage Land herself! She's also Polaris's half-sister. Last seen killed by Magneto after he saw too much of himself in her.