According to this Kotaku piece, the original Okami team's credits have been cut from the Wii version. Capcom's said this is for legal reasons, apparently, as the company's not allowed to use the Clover logo any more, although it hasn't been explained why names couldn't have been added without the logo.
Original Clover director Hideki Kamiya isn't amazingly pleased about it, rather obviously.
"I really don't know what under pretext the credits were cut," he said. What do you all think? I feel dejected, and not only because my own name has been erased from my creation. Of course we have pride in our work and we want to scream 'We made this!' from the top of our lungs. But more than that, the fact that they cut the entire staff is utterly deplorable."
More through the link.