For the credit depends on the lease company, as they get the credit, since they are the one buying the car. For my wife's Bolt EV, the lease company credit us with an amount similar to the residual percentage. So until dealers get the rates, likely nobody knows.
Much as I think that new EVs should be leased, due to terrible resale value, for a Porsche it all depends on the MRM and then the usual lease numbers. I've had great numbers from Porsche once (a 981S Boxster at 73% on a 24 that was already heavily discounted), but usually they lease terribly unless you can write off the lease. Which is easier to do on a Taycan than it would be for a 911.