sounds to me like the PS4 will need to move beyond mere emulation and instead host an entire virtual PS3 to stop something like this...with a virtual machine, any PS3 signed software could run on the PS4 and the virtual PS3 could be utterly oblivious to the presence of the host PS4.
that would even solve a few issues like PSN and trophy sync etc...
any custom code could run quite happily though, but only on the virtual PS3 until the host PS4 is hacked too, but it wouldn't be through cracked PS3 software...
wouldn't take too much hardware wise to run either - provided the architecture is an upgrade of the PS3 and not entirely different i.e. no cell - especially if the PS4 can only run the vPS3 and nothing else at the time. a few small midllewares translating the vPS3 hardware calls to the host and all should be hunkey-dory.
in theory at least lol
Proud Sony Rear Admiral
