I don't think he will be a "personality" president. In his 10+ years as president and then chief officer of NOA, I don't recall him ever giving a single interview.
He's more of a corporate type, and will likely be more behind the scenes I think.
Largely speaking I think the philosophy/design for NX was pretty much complete under Iwata anyway. The job now will just be going forward and releasing the product.
I think his hiring is more about freeing Miyamoto/Takeda from the corporate responsibilities of managing a multi-billion dollar company. Those guys are creators and engineers, they're not business men, even Iwata had extensive experience as president of HAL and the business side, he wasn't picked to run Nintendo because he was a game designer.
