If there is one then it will be there simply to comply with across the model range CO2 emissions legislation.
But, who cares?
Even if global warming is a tangible issue (I think it isn't) then for the 50 or so Ferrari cars sold each year, each of which will cover little more than 1000 miles per annum then it's not really contributing much at all in terms of emissions.
Ferrari is owned by Fiat. If I was in charge of Ferrari I'd rebadge a JTD Stilo as a Ferrari, tweak the suspension so that it's very uncomfortable, remove the sound deadening panels so it sounds horrid and loud, ramp up the boost and fuelling electronically, over size the cooling system and then flog 'em as £25k Ferrari diesels.
Thus complying with the silly prescriptive laws.
Ferrari will be forced to do a diesel model, one way or another.