When Nintendo collaborate with an external developer on any given game, they often tend to be involved in its development themselves to some extent.
Examples of these sorts of collaborations include Sin & Punishment 2, Pandora’s Tower and Xenoblade Chronicles, where development is largely handled by the external developer (Treasure, Ganbarion and Monolith Soft, respectively, in the above cases), but Nintendo’s own producers oversee development and pitch in when required.
This is also the case with Bayonetta 2, which is being published by Nintendo, according to a tweet by the game’s supervisor, Hideki Kamiya.
Yup. RT @mjpingram Are there any Nintendo producers working on Bayonetta 2. I know it’s a common practice for games they publish.
— 神谷英樹 Hideki Kamiya (@PG_kamiya) September 22, 2012
Bayonetta 2 will be published for the Wii U but does not have a release date yet. PlatinumGames have previously stated that they hope to grow the Bayonetta brand further in partnership with Nintendo.