They are just slightly modified Bluray discs to avoid licensing costs and royalties.
Indeed. As a bonus, the Wii-U can't playback Blu-Ray movies.
But with this "hack" they may beable to, like the ones who owned the earlier Wii versions could playback DVD's once modded. Then Nintendo would have to change the disc drive and mod it that only Wii/Wii U discs will be readable.
"Do you smelllllllllllllllllllllll what The Rock Is Cookin" - the Rock "No but who farted??" - Everyone else