Not wishing to excuse their lazyness or (anything else) but
just to throw this thought into the mix.
They didn't actually include the 3D models or raw textures in the game but an representation of the textures and models.
The screen shots used only really existed on their own machines (in theory) that rendering of that frame only took place due to players actions within the game.
Sort of at best it could be argued that they only included a representation of another publishers game without permission. Perhaps in that thase they may be able to argue some form of "fair use"
Graphically though the game bust have been a real dogs dinner.
Anyway I have other trouble to cassuse now ;)
Why Jobs ?
No doubt he will sue as it's his role to steal other peopls ideas and pass them off has Apples own unique revolution