Pigman

Alongside zombie pigmen, Notch confirmed adding living pigmen. These would not appear in the nether.

Drops
It is likely Pigmen will drop pork. They could also drop cooked pork.

Interactions With Regular Pigs
Note: All of this is speculation.

It is not known if they would replace pigs, or be there with the pigs. It is also been rumored that there would be some different action if a Pig and Pigman meet. They could possibly ride each other, or some other activity.