According to this Gamespot article, Buzz! Master Quiz producer Emerson Escobar dropped a not so subtle hint at E3 today that Trophies may be on the way to PSP.
“The cool thing is it isn’t just getting the gold medal,” he said. “We’ve also implemented a trophy system. Let’s say you answer a question within one second, you get a lightning finger trophy. If you answer a question within half a second, you get a supersonic trophy.”
When asked if this meant Trophies were on the way to the handheld, he said, “Check back with us later.”
More through the link.