Judging from the recent available photos that contrasts both Nissan models, it seems that the assumptions, that the SpecV model would not be receiving any significant power upgrades over the standard GT-R.
What's more important is that the Japanese manufacturer would instead focus on improving driving dynamics through weight reduction and handling modifications, were not accurate.
It shows that the exhaust wheel of the new SpecV is larger than the regular Series II GT-R and comes with a flatter blade, indicating that the new model will come with a different turbocharger.
This is good news to tuners since they can expect to squeeze out more power from it before it maxes out. However, the important discovery here is that the SpecV will overshoot the regular GT-R's 485hp (362kW).
This further explains why the pricing for individual parts of the SpecV shows the turbochargers as a separate part and priced higher than the standard GT-R model.
This is not the first time that Nissan has underrated the power yield of its GT-Rs. Because of the voluntary power limit of 276hp (206kW) in Japan, this has become a common practice for versions of the preceding R34 model.