Emulation and achivement system.

the emulator will probably emulate the psn connection too

That's the part i don't get. Is more than a emulated PSN connection; must be a real server that can host several users if you want to achieve the on-line trophies. Maybe a space to use Hamachi, Garena or something like that, i don't know.

It isn't that easy to do that as most people tend to think. And it's not part of the purpose of an emulator, this goes far beyond accurately emulating the hardware. It would involve some serious hacking and cracking.
Imagine that all of Sony's anti-piracy protection is designed not to let games think they are connected if they're not.

Hahahaha, that will be like hell. Until now the flawless PS3 firmware was the 3.55 and that was few years ago. I really like the PlayStation products, but the PS3 protection system was extreme and Sony realize it too late. Even the more capitalist game developers with hardest DRM system like EA or Ubisoft didn't support the PS3 when it was new. I guess for that the PS4 looks like crap.