Here's some info about Future Trunks as the Time Patroller.

Dragon Ball Online Chronicles
http://www.kanzenshuu.com/forum/view...hp?f=8&t=24479

"The main goal of Dragon Ball Online is defeating the evil entity, “pale man”. The Trunks who appeared in the artificial human Cell Arc is requested to take the role of “Time Patrolman” by the Kaiōjikan."

The NTL press release and interview from 2009 at the Tokyo Grand Palace Hotel says to please think of him as the Trunks from the Cell Arc in Dragon Ball.

http://www.gamemeca.com/news/view.php?gid=81909

"`드래곤볼 온라인`의 최종 목표는 악의 존재인 `창백한 남자`를 물리치는 것이다. `인조인간 셀` 이야기에 등장한 미래의 트랭크스는 시간의 계왕의 의뢰를 받아 `시간의 경찰` 역할을 할 예정이다."