Luigi's Mansion Receives New Trademark

Nintendo has refilled their trademark for Luigi's Mansion. Why has Nintendo done this? Nobody knows. But plenty of people are guessing.

Could it mean a new Luigi's Mansion game for the Wii (or DS for that matter)?

Could it be that Luigi's Mansion is going to be a new entry in the New Play Control series, a group of Gamecube games Nintendo rereleased on the Wii with motion controls slapped on?

Is there some guy named Luigi who bought a big house and Nintendo isa worried that'll share a similar name with the game?

Or is Nintendo just keeping old trademarks in order and the refiling it means little more than a ghost vacuum with a dead battery?