Nintendo has recently filed a patent which allows the transfer of Wii games to a Wii hard drive.
Whilst nothing has been officially revealed regarding the patent, online speculation has of course ensued. Gaming publication Siliconera have come up with what’s regarded to be the most logical explanation:
Nintendo’s plan is to make a separate hard drive partition for each DVD game. Once games are saved on a hard drive, the Wii reads a directory and shows all available games with box art. This is done by accessing a virtual DVD partition on the hard drive. The interface also displays ESRB ratings and the patent mentions possible parental controls.