I think PD will be missing a trick not releasing these cars as DLC.
Given the current Nordschleife drama surrounding the ferrari, P1 and the Porsche, considering we won't be getting the Porsche, it would be nice to have the other two, and lambo as a filler for the porka.
I'd say we have a good chance of getting the Ferrari at some point.. Like 70%, lots of nice ferraris already in game, including the halo Enzo and FXX.
The P1 less of a chance due to the connection with forza, buy we have other McLarens, so I don't see a huge problem, so about 50% chance.
The lambo, I see a good chance of getting it. Many lambos in game, including the reventon and Aventador. So a 80-90% chance .