If you're a lawyer for Nintendo and your spidey senses are tingling, we may have an explanation. "Wii Backup Loader" is exactly what this (highly convincing) video suggests: a program which allows the Wii to play DVD game backups, in the form of modified ISOs. It runs from the Wii Homebrew Channel.
News of the program broke from the forums at tehskeen (note: we've linked to a related article due to tehskeen being down), though we'd expect this to hit peer-to-peer networks in the not-too-distant future, if it hasn't already. Just remember, kids: winners don't do piracy.