Actually, before that you have to get the Omega downloadable content pack from either Xbox Live or the PlayStation Store. Square Enix will release Omega as DLC after Final Fantasy XIII-2 launches in Japan on December 15.
Noel and Serah will also get an additional costume also through downloadable content. Square Enix did not release pictures or details about the extra outfit. Pricing and release date information will be shared at a later date.
In the announcement, Square Enix specifies this content is only announced for the Japanese market. While Square Enix confirmed downloadable content for North America and Europe, Famitsu says for this specific content whether or not it will be released in other regions is undecided.