Sure, since we're already into the calculation of small numbers. I saw that the P85D delivered a peak 1.29G of acceleration force during a 0-60 timing run. If the upcoming "power system" upgrade could sustain that force, it would result in a 0-60 time of 2.15 seconds. So I don't think that's going to happen.
But because I've never even seen 480kW in my P85D yet, even at WOT, then simply allowing the delivery of 515kW continuously would easily yield the 2.7s 0-60 times reportedly witnessed by some Tesla "insiders." When this happens in the wild, supercar owners everywhere will be infuriated, at least at first, but then will all have to own one.
The reason for the current delay may boil down to risk management. Every supercar and hypercar manufacturer knows that a certain percentage of idiots are going to total their cars shortly after buying them, simply because they do not know how to handle that much power. It may be a wise legal strategy on the part of Tesla to release the car at 80-85% power, do careful studies and analyses of crash rates, injuries, fatalities, etc., and be able to show data, years from now, that "due diligence" had been very carefully done prior to releasing the car at full strength. I see this as a fundamentally prudent and responsible strategy.
But, I also want more power, now, thank you.