Sony has confirmed that the footage showing a Trophy collection on the screen of a PSP was, in fact, showcasing the remote play feature of the system. It seemed like the more likely explanation for the footage, but even so, it gives me a sad in my heart.
"The screen shown on the end of the video showcases the Remote Play function on a PSP," confirms a Sony rep, “allowing you to take a look at your XMB, Trophies, friends and other content via your PSP. As it’s such a great feature and unique to the PlayStation format we wanted to showcase it."
I guess Trophies on PSP was too good an idea for Sony to embrace. It might make the PSP more successful, and Sony seems strongly against the idea of that ever happening. Ah well.