Nippon Ichi Software's American branch is set to reveal a new, unannounced PS3 RPG at a press event tomorrow. At past NISA events, the publisher has revealed games developed by Hit Maker, lending to speculation that the new game will be developed by Hit Maker as well. Recent trademarks filed by NIS also reveals the game may even be called "Last Rebellion".
It's also probable we'll hear about Atelier Rorona tomorrow as well. When we spoke with NISA last, they told us they it was "likely" they would handle the localization, but they would have more concrete plans as the game meared completion.
NISA's press event will be held tomorrow in San Francisco, from 6PM to 9PM PST.