Dead or Alive 5 Ultimate, Team Ninja revealed. As reported by Siliconera and Shoryuken, her addition will be preceded by a February update, bringing - what else - new costumes to the brawler.
To recap, Dead or Alive 5 Ultimate is the expanded re-release of the 2012 game, adding new stages, characters, modes, and the like. As for Marie Rose, Team Ninja added the Lolita madam to the arcade version of DoA5U back in November, finally filling the game's dearth of scantily-clad ladies.
There's no confirmation these dates apply outside of Japan, but the good news is that DoA5 updates have traditionally been concurrent or thereabouts across the globe.