They only said that the legend set + 5 new Santa outfits are the last 2013 DLC hinting they will probably make more DLC in 2014, but nothing time related was said on the matter. If i was to guess I would say there is high odds new DLC will be made sometimes in January starting from around 2 weeks from now, i personally don't think they will release new DLC next week, but with TN no one can really be sure.
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This has been mentioned before but some Valentines themed outfits would be great. Maybe some naughty nightwear for each of the characters.
I was the one who mentioned the Valentine's Day themed costumes. I think they also need to port the Private Paradise, also known as the Extreme Private Gravure movie gallery from the PS+ version as DLC for Ultimate. Not many seem to be requesting that, but maybe people can group up and spam send personal message requests at Team Ninja's facebook to release it as DLC.