According to the article:
"Muramasa: The Demon Blade for PS Vita won't just be a port of the 2009 Wii game, although that would be enough. Early information from Famitsu magazine reveals that the Vita release will get new downloadable content, consisting entirely of original material. According to Yoshifumi Hashimoto, Chief Creative Officer of publisher Marvelous AQL, the DLC will star a new hero."
I really enjoyed this title for the Wii, but never finished it. I'm looking forward to revisiting it on the Vita, with new content and trophies!