Star Ocean: The Last Hope Developer Q&A (GameSpot)

[Riachu]

Soriku said:

Riachu said:
nice article, now we now SO4 won't be the last one in the series

 

But wait...didn't he say SO3 was the the conclusion while SO4 was origins? I'm not sure what else they can do.

There is a huge time gap between SO4 and SO1 as well as SO2 and SO3.