That NSX project was cancelled last year officially by Honda where Honda recited reason to focus their R&D on green technologies.
http://www.leftlanenews.com/acura-nsx-cancelled.html
However, who knows now they might be having second thoughts with the overwhelming success that the first-ever exotic Lexus car LFA now seems to be enjoying. But, Lexus had the resources and time to dump into the project that Honda simply does not.
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""A great sounding, responsive, high-revving, naturally aspirated engine is part of the DNA of a thoroughbred sports car. No two ways about it."
- Lamborghini on turbocharging