It’s not confirmed but a tweet seems to say that Oda posted on facebook tha there will be a xmas present for the players!

Athena's KOF '98 costume will be free for a certain period of time according to Oda. #KOFXIV pic.twitter.com/RqvMHDIQBh

— MMaker (@SNK_Lover) December 15, 2016

THE KING OF FIGHTERS XIV:
DLC Costume “ATHENA (KOF ’98 ver.) ”is coming out soon! ?#KOF14 #KOFXIV pic.twitter.com/dxnMntz1xF

— SNK JAPAN (@SNKPofficial_jp) December 15, 2016

Also FREE THEMES FOR EUROPE!?!?  Confirmed at least for UK and France so far!

#KOFXIV #KOF14 New free themes for PS4https://t.co/rMINCBBmzc pic.twitter.com/nqpEAr5i4D

— ATRyoSakazaki (@ATRyoSakazaki) December 15, 2016

#????????????????? ?????????????????????????????????????????????(??`) pic.twitter.com/JLIJbwpaic

— ??@???????? (@hyshiro1118) December 14, 2016