Two videos of what appears to be the North American version of Mega Man Star Force 3: Black Ace seem to have surfaced on YouTube. These don't seem to be trailers, but rather user-created footage... or half-footage, since the bottom screen is MIA. Of course, how anyone was able to get their hands on this and record it is anyone's guess. If it interests you, however, then check it out for yourself:
Update: Never mind.
Source: Protodude's Rockman Corner