A tentative title is a temporary or initial title given to a project, like a book or movie, which may change later. It's like a placeholder name until the final title is decided upon. Full definition
The game was tentative titled Project Versus J before the name was officially changed to J - Stars Victory VS. Currently, only a Japanese release of the game for the PlayStation 3 and PlayStation Vita has been announced, however, no release date has been mentioned as of this time. (animegamesonline.com)
Continuing on the PSP but returning to the timeline and story - progression method of the original (as opposed to II «s mission - based progression), Valkyria Chronicles III: Unrecorded Chronicles (tentative title based on previous game -LSB-...] (elder-geek.com)
It was tentative titled Project Versus J before the name was officially changed to J - Stars Victory VS. The game is currently confirmed to be released in Japan for the PlayStation 3 and PlayStation Vita, however, no release date has been announced at this time. (animegamesonline.com)