Aksys have officially announced the Playstation Vita version of Muramasa: The Demon Blade for a U.S release. In North America, the game will be titled Muramasa Rebirth.
The original version of Muramasa was published by Ignition Entertainment and was somewhat lacking in its bland localisation. Muramasa Rebirth on the other hand, is getting a completely new localisation from Aksys.
Additionally, Aksys have confirmed that the previously reported DLC, which will allow you to play four additional short scenarios with four new characters, will be made available for purchase in North America.
Aksys haven't announced a release date for Muramasa Rebirth yet.
Update 1: The game will feature a separate jump button, unlike the Wii version which used "up" on the d-pad or analogue stick for jumping.
Update 2: Aksys confirmed a physical release: