I know Lani Minella voiced Pit in Brawl, but lots of people (including me) thought Pit sounded different between the E3 2010 and E3 2011 trailers. I've seen some comments that he might be voiced by Bosch in the 2011 trailer, so I'm just disproving that. Palutena also sounded a little more enthusiastic in the 2011 trailer, but I'm not sure if she had a different VA.
Wikipedia says Minella is still Pit, but then again Wiki isn't always right.
Pit DID sound different from the 2010 E3 and the 2011 E3. In the 1st one, Pit sounded like a pre-teen boy (which would have MADE SENSE); in this years E3, he sounds like...sigh...a girl again (a HUGE stepdown).