My first reaction; WTF.
New Atelier Rorona: Origin Story of the Alchemist of Arland retells first game in the Arland trilogy, which up until now had not been released on PSVita.
In the current canon Totori becomes Rorona’s student in Atelier Totori and then Totori mentors Meruru in Atelier Meruru. This pattern is about to break, as both Totori and Meruru will be in New Atelier Rorona. Dengeki PlayStation and Koei say that they will come from the future and will be fully playable.