Two words - improved fuel economy. When I read the all-new statement, I assumed the current 5.0 architecture would be the basis. For this displacement, I would not expect huge jumps to stay out of gas guzzler territory. The history of this engine has seen steady increases of about 20hp, the main exception being the 444hp Boss 302 engine, which required a reworked valve train and intake manifold, sacrificing a bit of low end torque.It is almost guaranteed to be down on torque vs the 6.2, so I think HP has to significantly higher. Obviously area under the curve and all, but only 20 HP from almost an entirely new engine (was it the crank that was the only carryover?) and DI?
Since you are planning on turbocharging, I would assume it's a moot point.
GM's larger displacement OHV engine is a different animal, and the size definitely benefits the torque production.