Ask Capcom. RT @ZeldaPrime: WiiU is to good for Okami 2! HD console and big touchscreen controller! Get on making Okami 2, Kamyia-san
Now you could take one of two ways. This could mean Platinum has interest, but Capcom own the IP, so they'd have to collaborate. The other way this could be taken all has to due with Kamiya's demeanor on Twitter. He loves to tease people, so a comment like this could simply mean ask Capcom to make it, seeing as how Platinum has no stake.