@deathofaninja: remember that the winner of the outfits don't determine what will become DLC.
If there will be another Halloween DLC pack where outfits from the fans will be included (thing that very likely will happen, otherwise wouldn't make sense to organize an Halloween contest in July), very likely all the characters will get a special costume. So or all the outfits will be inspired to fan designs, or just a part with the rest original work of TN: but in any cases not necessarily/not only the winners of such contest will become part of the DLC pack.
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On the page of the official site where appear the winner entries, TN added a message (the English is not perfect, but however understandable), not sure if you read this:
"Thank you to everybody who took part in this competition.
Please let us display the top 10 costumes selected by your voting from the unvierse. We might pick up some other costumes for the prize and including those, we will contact you separately through Facebook, Twitter and email. We apologize We delayed to exhibit some of your designs and a few of the costumes are missing. We will contact you shortly".
So even this time TN announced that other outfits not in the top ten could end to get some special recognition and prize like in the last contest, however this time the authors of such designs will be contacted privately (together with the authors of the top 10 designs), so apparently they will not be disclosed in a public way.