Dead or Alive 5 Plus will support Cross Play, Cross Save and Cross Buy DLC.
It's good to see a developer other than Sony take advantage of PS Vita features such as these, and what it means for users is that you'll be able to save games across the PS Vita and PS3 version, as well as share DLC content between the two. In fact you'll also be able to challenge players on PS3 from your Vita. Pretty impressive.
Dead or Alive 5 Plus is due to release this March.