It is entirely possible that pigs will grow wings and fly.
They'll have to flop around on increasingly malformed forelimbs for a couple million years, though. At what point these become protowings, I'm not at all sure, and am certainly baffled as to just how the pigs will know. But, know they certainly will, and they will find them quite sexy, to the exclusion of any other kind of pig, lol. I'd imagine they'll look like really, really fat bats. Really, really fat, pink bats, in fact. But, will they fly? Evolutionary faith says they will.