its already possible to unpack retail pkg. Its done on the ps3, you just cant play it after it installs. It asks you to go onto psn and get license.
The demo installers work though, and some full retail packages work as well, it's odd, but yeah. Just depends on what kind of content it is. Prologue, for example (which I actually bought, stupid Sony), wouldn't let me play it unless I got to go on PSN. Other stuff does work oddly enough.
If you hope to play PSN games we need to disassemble EBOOT.BIN, extracting retail packages is already possible with the PS3 itself though.
The nice thing about XBOX360 arcade games was that there was just a fixed flag at an fixed address that needs to be changed to unlock the full game, too bad it's not the case here