I'm not sure how the community would feel about that. UT puts you in situations where your opponent is carrying around 10 different guns at once, and the split second "he just pulled out a sniper rifle" reaction can be pretty important.
If they do have weapon skins carry into the game, Epic will have to be gatekeeper on approving all of them. If not, you'd have people reskinning their rocket launcher to look like it's something else, with negative gameplay effects.
Perhaps we'll see two tiers of aesthetic mods? Ones that anybody can create and use in their local / self-hosted games, and others that have been approved for online play?