I'm making fun of an old saying. When people say "do pigs fly" or "when pigs fly", it means it's never going to happen. So I came up with the joke where if you genetically engineer pigs to fly, we will get flying pigs, thus when people say they won't do anything until "pigs fly", they will be forced to do so since there are flying pigs.
In all seriousness, I would actually like to customize my character in ACHHD. Just because the demo only shows a few pics or images doesn't mean your character will always be that.