Sony considering having the PS4 continuing the HD re-release series to include PS3 games
During an interview with Eurogamer, SCE Worldwide Studios boss Shuhei Yoshida states the company is considering another option in regards to backwards compatibility besides cloud services.
Similar to the PS3 having HD re-releases of PS2 games, the PS4 could be getting re-releases of PS3 games with Sony considering a few games at the moment. The games specifically mentioned included previous HD remakes of the God of War set and Shadow of the Colossus along with Beyond and The Last Guardian from the PS3.
The plan would allow Sony to get around emulation issues involving PS3 games while also continuing the HD re-release/remake series with the PS4.
The announcement was also in reaction to previous announcements from Sony which stated the PS4 wouldn't allow direct PS3 disc-based or PSN-based backwards compatibility to be possible.