Until we receive further word on what they need done, they are mainly seeking to interact with active members who can assist them in whatever tests/help/etc they need in the near future.
I suspect at least ONE thing they need help with is some PS3 RCO files they would like examined or attempted to be decompressed with various PSP RCO utils. They would likely post the RCO files here, and (hopefully) members can provide feedback on them... which is why one thing they requested is that those who reply be familiar with PSP homebrew and RCO files/apps.
We are basically trying to establish some 'structure' here, where we have a public group of skilled "testers" who can assist the PS3 Devs with whatever they need help with, collaborating in the Forum on a regular basis.
And you have a PSP that can run .RCO apps right?