Apparently, along with the release date announcement for Japan (Dec. 15, 2011), SquareEnix also made mention that there is DLC planned for Final Fantasy XIII-2. The contents of said DLC is still a mystery, but it will happen this time around. It won’t be launch-day DLC, as it will come along sometime after the game’s release.
Also, those who pre-order the game at select retailers in Japan will be eligible to get some free DLC when it does go live. I’m kind of interested to know how a game like this will see DLC added to it, but maybe it’s just outfits, new music or the like? Who knows? It probably won’t be too much longer, since the game is out in about three months in Japan.