Siliconera - Gust added a bunch of extra content for Atelier Meruru Plus, a PlayStation Vita port of Atelier Meruru.
All of the downloadable content from the PS3 version is included on the cart. You get Rufus, Pamela, and Hanna as playable characters plus the Makina Domain area.
Tecmo Koei has the publishing rights to the franchise now, and they have been going the digital route for a lot of their games lately.
NIS America has said that they have retained the rights to the Atelier games that they have already published, but I'm not sure if an enhanced edition falls into that territory. I hope it does, because a physical copy is more likely that way.